These monster cookies are soft and chewy peanut butter oatmeal cookies loaded with chocolate chips and M&M’s. An easy and classic cookie that’s perfect for parties, after school snacks and special occasions.

There’s nothing better than a good cookie, and these loaded monster cookies definitely fit the bill. They’re packed with tons of chocolate, oatmeal and peanut butter and are adored by both kids and adults alike. Serve them alongside other great dessert recipes like black forest cupcakes, S’mores cookies, funfetti cookies or brownie cookies for a party.

A plate of monster cookies which are made with oats, peanut butter, chocolate chips and M&M's.

I happen to love monster cookies, they’re all of my favorite cookie flavors rolled up into one hand held treat! These monster cookies are the best I’ve ever had. I find that some monster cookies tend to be dry or hard, and my version comes out perfectly soft and chewy every time.

Monster Cookies Ingredients

To make this recipe, you will need butter, brown sugar, granulated sugar, a large egg, peanut butter, vanilla extract, all purpose flour, baking soda, rolled oats, M&M candies and semisweet chocolate chips.

How Do You Make Monster Cookies?

Preheat the oven and line a cookie sheet with parchment paper or a nonstick baking mat. Place the butter and sugars in the bowl of a stand mixer, and cream until light and fluffy. Add the egg, peanut butter and vanilla to the bowl, and mix again to combine. Next, add the dry ingredients of flour and baking soda. After you mix those in, stir in the oats. Add the M&M’s and chocolate chips to the bowl and fold them into the dough. Place balls of dough on the baking sheet. Press a few M&M’s and chocolate chips into the tops of the cookie dough balls. Bake until browned, then cool on a wire rack. Serve and enjoy!

Cookie dough with chocolate chips and M&M's on top.

Tips For The Perfect Cookies

  • Use a cookie scoop or a tablespoon measure to make sure all of your cookies are the same size
  • The cookie dough can be stored in the fridge for up to 3 days before baking. If you’re planning to make your dough ahead of time, you may want to omit the M&M’s and add them just before baking so that the color from the candies doesn’t stain the dough if it’s in the fridge for a while.
  • This recipe works best with rolled oats, which sometimes go by the name old fashioned oats. You can also use quick oats if that is what you have on hand.
  • Be careful to not overbake your cookies! They should just be a light golden brown around the edges. If they’re overbaked, they can get hard.
  • Use a high quality brand of chocolate chips such as Guittard or Ghirardelli for the best results.

Quick Tip

These cookies will stay fresh in an airtight container at room temperature for up to 5 days.

Balls of cookie dough on a baking sheet.

Recipe FAQs

What are monster cookies made of?

Monster cookies are chunky peanut butter oatmeal cookies that contain chocolate such as chocolate chips and M&M’s. They also contain standard cookie ingredients such as butter, sugar, flour and eggs.

Can you freeze monster cookies?

Monster cookies will stay fresh in the freezer for up to 2 months. Store the cookies in an airtight container or resealable freezer bag.

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Baked monster cookies on a sheet pan.

Flavor Variations

These cookies are delicious as-is, but you can use other ingredients to customize the flavors to your tastes.

  • Peanut Butter: You can use almond butter or sunflower butter in place of the peanut butter.
  • Chocolate: Instead of semi sweet chocolate chips, try white chocolate chips, milk chocolate chips, peanut butter chips or butterscotch chips.
  • Add-Ins: You can swap out some of the M&M’s and chocolate chips for other ingredients such as pecans, walnuts, coconut or toffee bits.
A stack of monster cookies with a bite taken out of one.

My kids request these monster cookies all the time, and I can’t blame them. Between the soft flavorful cookie and tons of chocolate, how could anyone resist?

Monster Cookies Video

Love This Recipe?

Please leave a 5-star 🌟🌟🌟🌟🌟 rating in the recipe card below & a review in the comments section further down the page.

4.78 from 18 votes

Monster Cookies

AuthorSara Welch
A plate of monster cookies which are made with oats, peanut butter, chocolate chips and M&M's.
These monster cookies are soft and chewy peanut butter oatmeal cookies loaded with chocolate chips and M&M’s. An easy and classic cookie that’s perfect for parties, after school snacks and special occasions.
Time
Prep Time10 minutes
Cook Time15 minutes
Total Time25 minutes
Course Dessert, Snack
Cuisine American
Serves 24 servings

Ingredients 

  • 1/2 cup butter softened
  • 3/4 cup brown sugar
  • 1/4 cup granulated sugar
  • 1 egg
  • 1/2 cup peanut butter I prefer creamy but crunchy will also work
  • 1 teaspoon vanilla extract
  • 1 cup all purpose flour
  • 1/2 teaspoon baking soda
  • 1 1/4 cups rolled oats
  • 1 cup M&M’s plus more for tops of cookies
  • 1/2 cup semisweet chocolate chips plus more for tops of cookies

Instructions 

  • Preheat the oven to 350°F.
  • Line a sheet pan with a piece of parchment paper or silicon baking mat.
  • Place the butter, brown sugar, and granulated sugar in the bowl of a mixer. Beat until light and fluffy, 1-2 minutes.
  • Add the egg, peanut butter and vanilla to the bowl and mix until combined.
  • Add the flour and baking soda to the bowl and mix until just combined. Stir in the oats.
  • Add the M&M’s and chocolate chips to the bowl and gently fold them into the dough.
  • Make 2 tablespoon sized balls of cookie dough and place them 2 inches apart on the prepared sheet pan. You will need to bake the cookies in batches.
  • Press a few M&M’s and chocolate chips onto the top of each cookie dough ball.
  • Bake for 11-13 minutes or until edges are lightly browned. 
  • Cool the cookies on the pan for 5 minutes, then transfer to a cooling rack.
  • Repeat the process with the remaining cookie dough. Cool all cookies completely then serve.

Notes

  1. Store any leftover cookies in a sealed container for up to 5 days, or you can freeze the cookies for up to 2 months.
  2. Rolled oats are sometimes called old fashioned oats at the grocery store.

Nutrition

Calories: 159kcal | Carbohydrates: 18g | Protein: 2g | Fat: 8g | Saturated Fat: 3g | Cholesterol: 17mg | Sodium: 86mg | Potassium: 88mg | Fiber: 1g | Sugar: 10g | Vitamin A: 130IU | Calcium: 15mg | Iron: 0.8mg

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Comments

      1. Ok thank you. My kids like it but I personally don’t like the texture. I’ll be making it for them for sure!

  1. 4 stars
    I made these and they are delicious, I used old fashioned oats and the oats were crunchy in the cookie. Should I have used quick oats?

    1. I always use old fashioned oats and haven’t had a problem with them being crunchy. They do have some texture to them but they shouldn’t taste raw. How long did you bake the cookies for?

  2. First batch just cooled. They look lovely. After tasting, I do think it needs just a pinch of salt, was surprised there wasn’t any in the recipe.

  3. Do I have to add anything if I want to leave the peanut butter out. I have a child that is allergic.

  4. I’m gluten free. Does this recipe transfer well with gf flours. I use namaste perfect flour mix. I can use it for most recipes, some I can’t.

  5. Would love to make this for my grandsons class but one child is severely allergic to peanuts
    Any suggestions on what the sub for the peanut butter would be appreciated!

  6. This sure looks yummy and delicious, will definitely a great hit with kids. Such a ingenuity to come up with this kind of recipe, especially the shape of the cookies that’s like a meat ball. I loved it.