One Giant Monster M&M Cookie

This giant monster cookie is enormous and satisfies the biggest chocolate peanut butter craving. Reduced down from my monster cookies recipe, this small-batch cookie recipe is plenty for 1-2 people.

Big M&M cookie

Have you ever made an enormous cookie before?

And don’t cheat by telling me you’ve made chocolate chip cookie pizza or chocolate chip cookie cake, both of which are meant for a crowd. No, no. I’m talking about a REALLY GIANT COOKIE meant for one person. Two if you’re willing to share the wealth.

This recipe, brought back to life from my blog archives, yields one absolutely enormous monster cookie. Don’t let these pictures fool you. This cookie is 6 inches in diameter and about 1 million calories of goodness. Those cracks you see? Call them the Cookie Grand Canyon. The chocolate chips? Actual chocolate mountains.

Its size is simultaneously ridiculous and awesome.

One giant monster cookie split in half

A few weeks ago, I made peanut butter bars and chocolate chip cookie brownie bars for a dear friend’s baby shower. I came home, realized I didn’t meet my chocolate and peanut butter consumption needs for the day– as one does– and decided to make a giant monster cookie when settling down for a night of Netflix. (Full honesty here: I did share it with my husband Kevin.)

But I forgot how good this recipe was!!!! Kevin asked me why we don’t make giant cookies more often. They’re just bigger, better versions of an already delicious food.

The next week I decided to remake, re-photograph, and repost it. A dessert this good– and this giant– should never get lost in the archives.

Welcome back, mega monster cookie! You’re looking better than ever.


Monster cookie dough

How to Make One Giant Monster Cookie

The ingredients are exactly the same as my regular batch of monster cookies, only significantly reduced. The process is the same too, but you only need 1 bowl! Cream butter and sugars together, then beat in the dry ingredients. It’s best to use a mixer, but if you don’t have one, make sure the butter is nicely softened so you can easily mix it.

Want to leave out the peanut butter? No problem. For a giant oatmeal M&M cookie, simply skip the peanut butter. For a chocolate version, try my XXL Death by Chocolate Cookie.

The only tricky part, if I can even call it that, is the egg. 1 egg is simply too much, so only use SOME of it. Crack 1 egg, beat it, then use 2 Tablespoons of the beaten egg. (Add the rest to your scrambled eggs the next morning!) Don’t use just the egg yolk or just the egg white in this cookie.

The cookie dough is a little sticky, but do your best to form it into a mound on the cookie sheet. A rubber spatula or spoon helps. You can always chill the dough in the refrigerator as you preheat the oven, too. Colder dough is easier to work with.

However, don’t chill too long or else the giant cookie won’t spread.

Peanut butter monster cookie dough on baking sheet

One giant monster cookie on baking sheet

No Cookie Dough Chilling

That’s actually a bonus in this recipe: no cookie dough chilling required! It’s quick and easy, a definite bonus when peanut butter chocolate cravings are on the line.

(Here are all of my no dough chilling cookie recipes.)

Depending on your oven and how tall the cookie dough mound is, this giant cookie takes anywhere from 20-30 minutes. Since it’s so large, it’s best to bake it at a slightly lower temperature. Keep an eye on it. The cookie is done when the edges and top are lightly browned. The center stays nice and soft, but eventually sets as the cookie cools.

One giant monster cookie

Your weekend will be totally delicious. But wait, there’s more:

More Giant Cookie Recipes

One giant monster cookie

One Giant Monster Cookie

  • Author: Sally
  • Prep Time: 10 minutes
  • Cook Time: 25 minutes
  • Total Time: 45 minutes
  • Yield: 1 cookie
  • Category: Dessert
  • Method: Baking
  • Cuisine: American


Use this cookie dough to make one giant monster cookie or 4 smaller monster cookies. Feel free to substitute the M&Ms or chocolate chips with your favorite add-ins such as chopped peanut butter cups, raisins, white chocolate chips, or chopped nuts.


  • 2 Tablespoons (29g) unsalted butter, softened to room temperature
  • 2 Tablespoons (25g) granulated sugar
  • 2 Tablespoons (25g) packed light or dark brown sugar
  • 2 Tablespoons (30ml) beaten egg (crack an egg, beat it, then use 2 Tbsp)
  • 1/2 teaspoon pure vanilla extract
  • 2 Tablespoons (31g) creamy peanut butter*
  • 6 Tablespoons (45g) all-purpose flour
  • 2 Tablespoons (10g) old-fashioned whole rolled oats (or quick oats)
  • 1/4 teaspoon baking soda
  • 1/8 teaspoon salt
  • 1/3 cup (65g) M&Ms
  • 2 Tablespoons (22g) semi-sweet chocolate chips, plus extra for garnish if desired


  1. Preheat oven to 325Β°F (163Β°C). Line a large baking sheet with parchment paper or a silicone baking mat.
  2. Using a handheld or stand mixer fitted with a paddle or whisk attachment, beat the butter, granulated sugar, and brown sugar together in a large bowl on medium-high speed until combined and creamy. Add beaten egg, vanilla extract, and peanut butter then beat on medium-high speed until combined. Scrape down the sides and up the bottom of the bowl as needed. Beat in the flour, oats, baking soda, and salt on low speed, then beat in the M&Ms and chocolate chips until combined. The dough will be sticky. If it’s too sticky to handle, chill in the refrigerator for 5-10 minutes.
  3. Shape into a mound in the center of the lined baking sheet. Bake for 20-30 minutes until edges and top are lightly browned. The center will look super soft, but it will set as the cookie cools. If the cookie isn’t spreading as it bakes, remove it from the oven, then gently flatten with a spoon.
  4. Cool the cookie on the baking sheet for 10 minutes before eating. As it cools, press a few chocolate chips into the top, if desired, for garnish. Cookie freezes well up to 3 months. Thaw at room temperature.


  1. One Batch: Want to make a whole batch of monster cookies? Here’s my recipe for Monster Cookies.
  2. 4 Smaller Monster Cookies: You can use this recipe to make four smaller monster cookies. Just divide the dough into 4 smaller mounds on the lined baking sheet. Bake for 10-12 minutes or until lightly browned around the edges.
  3. Peanut Butter: Use a thick non-natural style peanut butter such as Jif or Skippy. Crunchy peanut butter works, too! If using a natural peanut butter, make sure it’s on the thicker side. And feel free to skip the peanut butter, making no other changes to the recipe.

Keywords: cookie, monster cookies


  1. Cookies of any size are great, but there is something extra special about humongous ones and itty-bitty ones. πŸ˜‰ I love the shiny, melty chocolate chips just curling over like little waves. I’m glad your trip was fun! It looks so beautiful there…I’ve heard amazing things about St. Lucia; I should definitely go some day!

    1. Caley, you need to go if you ever can. Completely gorgeous! And I love your comparison or the chocolate chips and waves πŸ˜‰

  2. What a great surprise for Kevin to come home to! Hehe, he definitely has the best fiancΓ© ever! Love giant cookies and this one looks and sounds insanely delicious with all the M&M’s and peanut butter. Yum! Welcome back and hope you had a fantastic time in St. Lucia!

    1. Thanks so much Kelly! I couldn’t think of a better surprise than a giant peanut butter cookie, can you?! πŸ˜‰

  3. Oh yes! These are so fun and the perfect treat! Not sure if I could share though. These look awesome Sally and reminds me that I have yet to make any giant cookies! I know, crazy!! I think this is the recipe! Thank you!

    1. I love giant cookies. πŸ™‚ And Tieghan – you would too! I need to catch up on the posts I missed on your blog while I was gone. πŸ™‚

  4. Ive been wanting to make some one-serving cookies myself lately! There are times when, well, given all I am baking, I don’t need 12 to 24 cookies. I just need…one πŸ™‚ And what a nice surprise for Kevin!

    And the M&Ms….LOVE how well-studded with them this cookie is! Being skimpy with them isn’t an option for me either!

    1. Never skimpy with the M&Ms and chocolate chips. πŸ˜‰ Just like all the M&MS on your cosmic brownies. YUM!

  5. “Sometimes you just have a giant peanut butter craving”…that’s all the time for me! This monster cookie looks amazing!! Believe it or not, a giant cookie would actually help me with portion control (assuming I share with my husband!) because when I make a whole batch of normal sized cookies, I usually end up eating at lesat 3!

  6. So fun! My husband’s birthday and Father’s Day is in two weeks. I should make this for him as a surprise. Then I can win the title for “wife of the year.” πŸ™‚

  7. Yes! I will admit that my most favorite cookie ever is the monster cookie. Your distinction of peanut butter cookie with oats vs. oat cookie with peanut butter made me laugh and yet is SO true. But what makes a monster cookie is the MnMs hands down. I live for those MnMs in monster cookies. I just polished off a batch and so this single serve would be perfect. Four cookies in one? Pshaw, who needs to share:)

    1. It’s VERY true – it’s a peanut butter with oats! Not the other way around. At least that’s how I prefer it. πŸ™‚ The M&Ms are my favorite part! And there is a TON of them in this!

    1. Yes! And you have to start with this one. Or the chocolate one – or any of them will do πŸ˜‰ Thanks Marcie!

    1. I waited too long to share it with you guys! But I’m glad you remembered it, Faith! Let me know if you try it sometime.

  8. So jealous of your trip πŸ˜‰ But glad you had fun!! I think I need to make a giant cookie for me (and mayyyybe to share… maybe not lol). This one looks really good! You definitely are fiance of the year for sharing yours πŸ˜‰

    1. Eat it with a very hungry boy and you won’t be able to eat the whole thing! But making it for yourself? You won’t be able to show any restraint! It’s delicious. πŸ™‚ Thanks Pamela!

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About Sally

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I’m Sally, a cookbook author, photographer, and blogger. My goal is to give you the confidence and knowledge to cook and bake from scratch while providing quality recipes and plenty of pictures. Grab a cookie, take a seat, and have fun exploring! more about Sally