Peanut Butter Stuffed Brownies

Fudgy homemade brownies stuffed with a creamy peanut butter filling. If you like peanut butter cups, you'll love these!!

Attention all peanut butter lovers!

Last week, I shared my favorite chewy fudgy homemade brownie recipe. My hungry fiancé and friends asked for them again (they’re that good), so today I bring you chewy fudgy homemade brownies, peanut butter style.

These brownies will blow your chocolate and peanut butter loving mind.

The idea is quite simple. Make my ultra fudgy homemade brownies. Stuff them with a peanut butter cup filling of sorts and top with… you guessed it… more peanut butter and chocolate. Sip a healthy smoothie as you go and then put on your fat pants. Prepare to overindulge; it’s amazing.

Fudgy homemade brownies stuffed with a creamy peanut butter filling. If you like peanut butter cups, you'll love these!!

I explain quite a bit of science behind making the perfect brownie here. Learn all about the chocolate to sugar to flour to egg ratio, and why each ingredient is so important. You can’t really bake my homemade brownies without a little background knowledge. After all, baking is like chemistry. Delicious chemistry.

Fudgy homemade brownies stuffed with a creamy peanut butter filling. If you like peanut butter cups, you'll love these!!

Let’s discuss the peanut butter filling. It’s basically the same peanut butter filling that I use to make my Chocolate Covered Pretzel Peanut Butter Bites. It’s a very, very thick filling – like a crumbly cookie dough. You’re going to grab chunks of it, flatten them out, and layer on top of brownie batter. It doesn’t have to be pretty. Mine certainly isn’t!

Then, top the peanut butter layer with the rest of the brownie batter. And press a few chocolate and peanut butter chips on top.

Here’s a little visual:

Fudgy homemade brownies stuffed with a creamy peanut butter filling. If you like peanut butter cups, you'll love these!!

The brownies take about 35-38 minutes, or longer depending on your oven. Sometimes mine take 35 minutes, other times 40. My oven is full of surprises. Just keep your eye on them after 30 minutes; a toothpick inserted in the center should come out with only a few moist crumbs. That’s when you know they are done.

Waiting for the brownies to fully cool will feel like a lifetime.

Fudgy homemade brownies stuffed with a creamy peanut butter filling. If you like peanut butter cups, you'll love these!!

The brownie layer is fudgy and chewy, while the peanut butter layer is soft and dense. Kevin and I both thought the peanut butter filling was reminiscent of a Reese’s peanut butter cup filling. Yes, these brownies are basically a giant pan of Reese’s cups.

Need I say more?

I made these brownies for my bud Erin. I’ve been dog-sitting her new puppy while she’s at work – he’s a goldendoodle and only weighs 6 pounds. His name is Chips, so naturally I call him Pickle Chips. I left today’s brownies for her and she said her coworkers gobbled them up in minutes! I’m absolutely not surprised. Breakfast of champions, ya’ll.

Fudgy homemade brownies stuffed with a creamy peanut butter filling. If you like peanut butter cups, you'll love these!!

These insane brownies should really come with a warning label!

Follow me on Instagram and tag #sallysbakingaddiction so I can see all the SBA recipes you make. 

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Peanut Butter Stuffed Brownies

  • Author: Sally
  • Prep Time: 30 minutes
  • Cook Time: 35 minutes
  • Total Time: 1 hour, 30 minutes
  • Yield: 16-20 minutes
  • Category: Brownies
  • Method: Baking
  • Cuisine: American

Description

Chewy, fudgy homemade chocolate brownies stuffed with a peanut butter filling and topped with peanut butter and chocolate chips. If you like peanut butter cups, you’ll love these!


Ingredients

  • 1/2 cup (115g) salted butter*
  • 8 ounces (228g) coarsely chopped quality semi-sweet chocolate*
  • 3/4 cup (150g) granulated sugar
  • 1/4 cup (50g) packed light brown sugar
  • 3 large eggs
  • 1 teaspoon pure vanilla extract
  • 1/2 cup + 2 Tablespoons (80g) all-purpose flour (spoon & leveled)
  • 2 Tablespoons (11g) unsweetened cocoa powder
  • 1/4 teaspoon salt

Peanut Butter Filling

  • 3/4 cup (185g) creamy peanut butter
  • 1 cup (120g) confectioners’ sugar
  • 2 teaspoons pure vanilla extract
  • 2 Tablespoons (30ml) milk
  • 2 Tablespoons each chocolate chips and peanut butter chips

Instructions

  1. Melt the butter and chopped chocolate in a medium saucepan on medium heat, stirring constantly, about 5 minutes. Or melt in a medium microwave safe bowl in 20 second increments, stirring after each, in the microwave. Remove from the heat, pour into a large mixing bowl, and allow to slightly cool for 10 minutes.
  2. While the chocolate mixture is cooling, make the peanut butter filling. In a medium bowl using a handheld or stand mixer fitted with a paddle attachment, beat the peanut butter, confectioners’ sugar, vanilla, and milk together on medium-high speed until combined. The mixture will be very thick – like a crumbly cookie dough. Set aside.
  3. Adjust the oven rack to the lower third position and preheat oven to 350°F (177°C). Line the bottom and sides of a 9×9 inch square baking pan with aluminum foil, leaving an overhand on all sides. Set aside.
  4. Whisk the granulated and brown sugars into the cooled chocolate/butter mixture. Add the eggs, one at a time, whisking until smooth after each addition. Whisk in the vanilla. Gently fold in the flour, cocoa powder, and salt.
  5. Pour/spread half of the brownie batter into the prepared baking pan. Take large chunks of the peanut butter filling and flatten with your hands. Place flat pieces in an even layer on top of the brownie layer, as shown in the photo above. Pour/spread the remaining brownie batter on top. Top with the chocolate chips and peanut butter chips. Using the back of a spatula, gently press the chips into the brownie batter.
  6. Bake for 35-36 minutes or until the brownies begin to pull away from the edges of the pan. (The brownies may slightly crack in the center – that’s because air in between the peanut butter layers is trying to escape. That’s normal!) A toothpick inserted in the center should come out with only a few moist crumbs when the brownies are done. All ovens are different, so keep an eye on them after 30 minutes and use the toothpick test to see when yours are finished.
  7. Allow the brownies to cool completely in the pan set on a wire rack. Once cooled, lift the foil out of the pan using the overhang on the sides and cut into squares. For neat squares, I use a very sharp knife and wipe it clean with a paper towel after each cut.

Notes

  1. Make Ahead & Freezing Instructions: Brownies stay fresh in an airtight container at room temperature for 1 week. You can freeze the brownies for up to 3 months. Thaw overnight in the refrigerator before serving.
  2. Butter: I love to use salted butter here. If you choose to use unsalted, don’t increase the salt in the recipe. I find that there is no noticeable taste difference between using salted and unsalted butter in this particular recipe.
  3. Chocolate: I typically use Baker’s, Ghirardelli, or Trader Joes chocolate.

Keywords: chocolate peanut butter brownies, peanut butter stuffed brownies

Fudgy homemade brownies stuffed with a creamy peanut butter filling. If you like peanut butter cups, you'll love these!!

201 Comments

  1. Sally these brownies were incredible! I won’t even say how many I ate the day I made these :X One thing that I did notice when I made these was that my peanut butter filling didn’t have the same consistency as yours did. Mine turned out to be more like a frosting rather than a crumbly texture. Did you have that problem at all when you made these the first few times? Either way they were still delicious and I will be making these again!

    1. Mine was the same way when I first started mixing it. The longer I beat it the thicker it got. Just keep mixing it and it will thicken.

    2. Through a mistake, I added the flour to the p-nut mixture. Also added to the chocolate mixture and they came out Per-Fect!

  2. These were delicious fudge brownies. However, I had the same problem as Chelsea; the filling was spreadable and not thick. Then it baked into the brownies and I didn’t have the ribbon layer. The ingredients are different than the Peanut Butter filling with the pretzels and I wondered if there was something missing for the brownie recipe????

    1. Hi Laura. No, there is nothing missing from the filling recipe as written. Are you using runny peanut butter? You may try leaving out the milk if you try again.

    2. As I let others know, I added the flour to the peanut-butter mixture by mistake. Also added it to the chocolate batter and they came out perfectly!

  3. I made these last night and they came out perfect! They are so moist and delicious my entire dinner party loved them. The foil was a brilliant idea, easy cleanup! My brother inlaw in addicted to peanutbutter and he made a copy of the recipe so his wife could make him a batch. Thanks for another great recipe. Best of luck with all your wedding plans. It sounds like you are enjoying the journey and that is a blessed thing:)

  4. I made these for my son’s wedding — turned out excellent. Easy to follow. I used some as the brownie in a trifle –bride and groom thought it was great breakfast 🙂

  5. Yikes!! I’m not sure what happened…. I followed your recipe exactly but when I cut the brownies, I couldn’t see the peanut butter layer like in your pictures. I’m giving these as gifts so I couldn’t taste them but I’m sure you can still taste the peanut butter goodness in the middle. To look at them, though, they just look like brownies. Any ideas?

    1. I wonder if my brownies had the same issue. My oven has 9 positions so I just put my brownies on the bottom rack in the third-from-bottom position and my brownies fluffed up a bit more than they should have. They also took 10-15 minutes longer to cook. The only other change in the recipe is that we usually only use Self-Rising flour in my house, so that’s what I had on hand. The brownies ate the peanut butter, but they still tasted great. I was asked to make a second batch, which I probably will today (we now have all-purpose flour for baking)

      In a 9 position oven, where should I have the bottom rack?

  6. I saw the comments about the peanut butter layer being too runny, so I made sure to use my Skippy Natural peanut butter and kept the mixer running for about a minute after everything came together. I just cut the brownies and they turned out great! Thanks for the perfect recipe for this peanut butter/chocolate combo addict.

  7. I have no idea what went wrong, I followed the recipe, and everything seemed to be going well, but when i looked in the oven after 35 minutes it was nothing but a bubbly soupy mess! I tried keeping it in but it just burned around the edges and was boiling liquid in the middle. Why did this happen??

    1. That’s odd. It sounds like an oven issue, not an ingredient issue. I would double check your oven temperature with an oven thermometer and make sure you are baking on a lower baking rack.

  8. HI, I’ve been trying to make these brownies for the past 2 days!! (I’m a single mother of 8 month old twins and it’s been hard to find a large enough chunk of time to do it) I finally get all my ingredients out, all my bowls and mixing utensils, every thing is ready – and I realize I don’t have a square glass or metal baking pan. I know I could double the recipe and make it in a 9 x 13 but I don’t have enough ingredients. Would it be okay to use a square corning ware dish?

      1. They’ve been in the oven over an hour and I’m still getting a little goo on the toothpick! Bah!

      2. Sarah Kay, is it a wet goo or just wettish crumbs? The PB layer is a moist layer. I wonder if your oven temp is off or if your pan was 8″ not 9″. That will make a difference in time to cook and struggle to get the middle done. I made these, using corning ware, and I didn’t have a difference in cook time. The PB layer should have been like play doh, not runny at all. Once it cooled, it was more set. I’m sorry of your struggle — my twins are almost 14. I so know your world. I nursed, too. Good luck — use a box mix for the brownie in a time crunch and add the PB layer.I know how crazy any time is with twins….

  9. I love your recipes, they are inspiring some fun ideas. Though I am curious have you thought about making these brownies in a muffin tin? What would you guesstimate the cooking time to be?

    1. hi tiffanie. i’ve never done that before but i’m sure they would turn out wonderfully. i have no clue on the bake time– maybe 22-25 minutes if using a 12-count muffin pan?

  10. these are in the oven as I post this comment. I put exactly 1/2 cup of butter (1 stick) and they are soooooo oily. They are drowning in butter. Not sure what happened but I followed the recipe to the T.

  11. Oh! These came out fabulous! Despite my dumb faux pas. When I went to add the flour to the chocolate mixture, only the confectioners sugar remained among the ingredients. I’d already added the flour to the sugar/peanut mixture by mistake. But read on, this may help those who had problems with the “stuffing.”

    Undeterred, I added the required amount of flour (plus a bit more) to the chocolate mixture. The center layer with the added flour was consequently pretty dry and crumbly and could easily be evenly spread over the bottom layer.

    Well, you know, this might be the answer to some people’s problem of the center layer disappearing, because it came out perfectly, fully baked after 35 minutes and looking kinda like the photo.

    Another thing is we live at over 7,000 ft elevation and typically need to add more flour to the recipes.

    This was so rich, I didn’t add chocolate/peanut butter chips for the top. Also, I used crunchy peanut butter, not smooth. That was great.

    You might just go ahead and try 1 1/4 cups flour in the chocolate mixture AND another 1 1/4 cups in the sugar/peanut butter mixture. My family scarfed it up!

    So, I’m dumb. But people say I’m pretty enough to overlook being dumb. Well, a couple people say that, anyway. Okay, so I’m their mommy…

    Happy Eating! — Priscilla

    1. That’s so helpful, Priscilla! I live in Colorado Springs (after living in Chicago for 40 years) and was hoping these would work the first time- I’m so glad I read your comment- thank you!

  12. Hi Sally. Not sure if you’ll get my question in time, but I’ll ask anyway. Do you think I could get away with using heavy cream in place of the milk in the peanut butter filling or even coconut milk? Thanks so much!!

  13. The chocolate layer was so sticky it wouldn’t spread along the top. I ended up getting frustrated and pitching the whole thing. Way too stick to do anything with.

  14. This is the most incredible, decadent chocolate peanut butter dessert I’ve ever had. Chocolate and peanut butter is my favorite combination but the cookies and brownies I’ve tried always leave me disappointed. Not these! Since discovering this recioe I’ve lost count of the number of times I’ve baked them, and they’ve turned out perfect every time.

  15. Hey Sally!
    Amazing recipe! Thanks a bunch!

    Quick question for you, the first time I tried melting the butter and choc together it appeared to curdle once the butter fully melted.

    I did it again on a low heat and looked fine but noticed when I started to combine the sugar & everything else to the choc mix it slightly resembled a curdled look.

    They ended up tasting great anyway but is that normal?

    Thanks again you rock! \m/

    1. It is not normal! Strange. I feel the heat was too high both times. Is your butter expired? As you melt the chocolate and butter together, try stirring constantly. That should help.

  16. These brownies were delicious! I used 6 oz os semi sweet dark organic baking chocolate and 2 oz of unsweetened dark 100% cacao organic baking chocolate and the chocolate flavor was huge! Used Skippy’s Naturals for my peanut butter layer, and I noticed and solved a problem with the directions by looking through the comment section: the additional measure of 2 tbsp of flour belongs in the peanut layer batter, though it’s not referenced again in the step by step directions, and it’s the key to getting the “dry cookie dough” texture so that the peanut butter layer stays separated. Thanks for a delicious recipe! Was a big hit with my boyfriend for Valentine’s Day. Next batch, we’re adding nuts!

    1. The 2 cups + 2 Tbsp of flour are all used in the brownie batter. But I’m glad the other way works for you. Thanks for reporting back!

  17. This is by far the best brownie I ever made…thank you Sally for sharing the recipe..I followed to the T and it was sumptuous..a big fan now!!

  18. These were great. I didn’t have any semisweet chocolate so I used an off brand hazelnut cocoa spread(like Nutella) & about 1/4 cup less granulated sugar & they turned out great!!!

  19. Now I’m confused…. The base recipe calls for a 9×9 pan. However when someone asked if they could double ingredient amounts specified and use a 9×13 pan you said yes. Note that the 9×13 pan is 44% larger in area than the 9×9 pan. So by doubling the ingredients then the height or depth of the brownies will increase substantially. Did you comprehend that? I would prefer the larger pan size but only if the brownie quality is not impacted. .

    1. Yep, double the recipe for a 9×13 pan works wonderfully. While yielding a larger amount, the brownies will also indeed be taller. When baking a larger batch, I find the texture and taste is not compromised.

  20. in the end, the cake came really moist and wonderful. My man is in heaven .. : ), for sure i will try some of your others recipes .

  21. My peanut butter mix was crumble lol. But I made it work by just putting on there and it turn out just fine. I can never stick to the recipe, I am always adding something in there. I added Nestles peanut butter filled chocolate chip called Delight Full and Resse’s chip in both the brownie batter and peanut butter mix. My dad is a peanut butter lover so this recipe was great. Everyone love it, absolute delicious! (We all ate it when it came out with more peanut butter ice cream haha) Thank you for sharing this recipe. Maybe your next book should be a “Peanut Butter Lover” book for all the peanut butter lovers out there.

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