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The SOFTEST Peanut Butter Cookies. They melt in your mouth and are exploding with peanut butter flavor!

peanut butter M&M cookies

In 100% complete seriousness, I’d like to crown these cookies the most perfect cookie I’ve ever made. That’s high praise for an innocent little peanut butter cookie! They easily take the cake for tastiest, fluffiest, chewiest, and peanut buttery-est cookie I’ve ever had.

Loaded with M&Ms for any holiday, these soft cookies are a year-round festive treat. My coworkers GOBBLED them up in minutes, even asking me if they were from a bakery.

The cookies are nothing like the traditional hard, crunchy peanut butter cookies you are used to. The exact opposite, in fact. They are so soft that they will literally melt in your mouth. A peanut butter cookie recipe GOLDMINE.

What I love most about these cookies is just how easy the recipe is. I’ve made them so many times and they never disappoint. Enjoy! 🙂

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peanut butter M&M cookies

Peanut Butter M&M Cookies

  • Author: Sally
  • Prep Time: 1 hour, 30 minutes (includes chilling)
  • Cook Time: 11 minutes
  • Total Time: 1 hour, 45 minutes
  • Yield: 32 cookies 1x
  • Category: Cookies
  • Method: Baking
  • Cuisine: American

Description

The SOFTEST Peanut Butter Cookies. They melt in your mouth and are exploding with peanut butter flavor!


Ingredients

Scale
  • 1/2 cup (1 stick or 115g) salted butter, softened to room temperature*
  • 1/2 cup (100g) packed light brown sugar
  • 1/4 cup (50g) granulated sugar
  • 1 large egg
  • 3/4 cup (185g) creamy peanut butter
  • 1 teaspoon pure vanilla extract
  • 1/2 teaspoon baking soda
  • 1 and 1/4 cups (156g) all-purpose flour (spoon & leveled)
  • 1 and 1/2 cups (300g) mini M&Ms

Instructions

  1. In a large bowl, using a hand-held mixer or stand mixer with paddle attachment, cream the butter and sugars together on medium speed. Mix in the peanut butter, egg, and vanilla (in that order). Slowly mix in the baking soda and flour. Do not overmix. Fold in the M&Ms with a wooden spoon. Chill the dough for at least 1-2 hours and up to 3 days.
  2. Preheat oven to 350°F (177°C). Drop chilled dough by scant tablespoonfuls onto ungreased cookie sheet or silicone baking mat. I pressed a few M&Ms on top of the dough balls. Press the balls down (only slightly) since they won’t spread much while baking. Bake for 11-12 minutes. Cookies will be soft and may appear undone. They will firm up as they cool.
  3. Allow to cool completely on a wire rack. Enjoy!

Notes

  1. Butter: You may use unsalted butter in this recipe. If so, add 1/4 tsp salt with the flour.
  2. Be sure to check out my top 5 cookie baking tips AND these are my 10 must-have cookie baking tools.

Keywords: peanut butter M&M cookies

Reader Questions and Reviews

  1. I made these with red, white and blue M&Ms, for Veteran’s Day. I did add about 2 tbs of cookie butter, as it finished off the jar and a handful of mini chocolate chips. Took about 3 dozen to the VFW and when I left, there were only 3 left. Everyone loved them. Thanks, Sally, for another keeper!

  2. Just made these with natural peanut butter and margarine. Came out delicious! I know it’s taboo, but that is all I had at the time. Forgot the salt as well, still so good!

  3. Is it alright if I halve this? Would I need to alter baking times or temp? Thank you!

  4. Hi Sally, I’m a huge fan of your cookies and long-time follower! Question regarding chill time– if I need to make these cookies 1 day in advance, is it okay to chill the dough overnight? Would you recommend I let the dough come back to room temperature before baking? Thank you!

    1. Thank you, Mallory! Yes, you can shills the dough overnight. If it is too hard to scoop you can leave it out at room temperature for about a half hour.

  5. Hi Sally! Just discovered your website! Can I freeze this dough? I like to have cookies ready to treat my toddler.
    If yes, what is your suggestion for thawing?

    1. Sorry, I meant to say “I like to have cookie dough ready to treat my toddler!”

    2. Yes – you can freeze the individual dough balls so that you can just pop them out of the freezer and bake a few at a time. No need to thaw – just add an extra minute to the bake time!

  6. Hi Sally, what do you think of using peanut butter filled m&m’s? I have some on hand so I thought I would try put i’m worried they might turn out too gooey. Any suggestions?
    Thanks!!

    1. Hi Emily! They won’t be too gooey at all. The PB M&Ms are rather large, so feel free to chop them before adding to the cookie dough.

      1. I tried this recipe with peanut butter m&ms because that’s all I had and they turned out great! Not too big at all’

  7. Hi Sally! Wow these look fantastic. I’m making cookies for Christmas and trying to do as much ahead of time as possible. Do the baked cookies freeze well? Thank you for the delicious bakes!

  8. Just found out a dear relative is gluten-free. Can this recipe work gluten free using Bob’s Red Mill Gluten Free 1 to 1 Baking Flour?
    Thanks

    1. Hi Marjorie, I haven’t tested this recipe with gluten free flour but please let me know if you do!

  9. Wow! Made these cookies on a whim when looking for recipes to use with peanut butter m&m’s. I don’t normally like PB cookies or do I leave a review but these are amazing! They were even better the day after. I was a little worried because the cold dough was a little dry, especially toward the end of scooping. I tried one pan where we pushed them flat as we stuck m&m’s on and another one where I left them as rounded as possible. Round ones were better, I think. A little crumbly when they first come out but as they cook, they firm up into a cakey kind of cookie (well, as cakey as you can get with a PB cookie). This recipe is definitely a keeper. Thanks!

  10. If I’m going to bake I always use your recipes! how about making these w normal chocolate chips? Any reason I shouldn’t try this? Thanks!

    1. Chocolate chips will be fantastic in these cookies, Bethany – enjoy!

  11. These cookies are soooo good and they are my moms favorite!

  12. My dough is in the fridge right now, but I do wonder what would happen if I baked them without chilling the dough first. I’m impatient!

    1. Hi Darlene, without chilling the dough, the cookies will spread too much in the oven and result in flat cookies. It’s worth the wait!

  13. This may be a dumb question but if I’d like to form the balls then freeze them do I still need to chill the dough for 1-2 hours first or can I form them right after mixing? I know you said you can bake frozen dough balls just by adding an extra minute. Thank you!

    1. Hi Kristin! We prefer to chill the dough before rolling balls just because the dough can be a bit sticky to work with. But you can go ahead and roll the dough, then freeze without chilling if you don’t mind the sticky dough!

  14. I made these cookies with my mom and I’m waiting for them to cool down after baking I wanted to give some to my grandpa who is here

  15. If I only have UNsalted butter on hand, how much salt could I add to help balance the dough? Thank you!

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