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0 from 252 votes

One-Bowl Monster M&M Cookies

Crafted with ease and taste in mind, this recipe is a great choice.

Prep Time
15 mins
Cook Time
15 mins
Total Time
25 mins
Servings: 36 Cookies (2 to 3 Dozen Depending on Size)
Course: Dessert
Cuisine: American

Ingredients

  • 3 3 large eggs
  • 1 ¼ 1 ¼ cups packed light brown sugar
  • 1 1 cup granulated sugar
  • ½ ½ teaspoon salt
  • 2 2 teaspoons baking soda
  • 1 1 teaspoon vanilla extract
  • 1 ½ 1 ½ cups creamy peanut butter
  • ½ ½ cup salted butter softened
  • 4 ½ 4 ½ cups quick cooking oats (double check oats are gluten-free if making gluten-free cookies)
  • 1 1 cup M&Ms
  • 1 1 cup milk chocolate, semisweet, or bittersweet chocolate chips

Instructions

    Cup of Yum
  1. Preheat the oven to 350 degrees F. Line cookie sheets with parchment paper, silpat liners or lightly grease with cooking spray.
  2. In a large mixing bowl with a handheld electric mixer (or in a stand mixer fitted with the paddle attachment), add the eggs, brown sugar, and granulated sugar. Mix well.
  3. Add the salt, baking soda, vanilla, peanut butter and butter. Mix until creamy and well combined, 1-2 minutes.
  4. Stir in the oatmeal, M&Ms, and chocolate chips until combined. The dough will be sticky.
  5. Scoop the dough into heaping tablespoon-sized balls (see note) and place about 2 inches apart on the cookie sheets. If you want the cookies thinner, flatten them slightly with the palm of your hand.
  6. Bake the cookies for 8-10 minutes. Don't overbake - the cookies should just be set and very lightly golden around the edges.
  7. Let the cookies sit for 1-2 minutes on the cookie sheet before transferring to a cooling rack to cool completely. Store in a airtight container for 2 days (the baked cookies freeze well, also).

Notes

  • Gluten Free: keep in mind that if you want the cookies to be safely gluten-free, make sure your oats are certified gluten-free (it will say on the package if they are).
  • Oats: several commenters have successfully used old-fashioned oats (the cookies may spread a bit more). Or you could take your old-fashioned oats and process them lightly in a blender before using (measure after they have been blended a bit). 
  • Chips: also, lots of times when I make these, I sub in different kinds of chips. Peanut butter chips are dreamy (in addition to or in place of M&Ms or part of the chocolate chips). 
  • Cookie Size: many of you commented you've gotten a lot more than 2-3 dozen cookies out of this batch and that's because you make your cookies small and I make mine not-small. Sometimes, I use my #40 medium cookie scoop which is about 1 1/2 to 2 tablespoons but a lot of time, I grab the #20 scoop which is 3 tablespoons or more. I mean, we're going for monster cookie here, right?

Nutrition Information

Serving 1 Cookie Calories 224kcal (11%) Carbohydrates 28g (9%) Protein 5g (10%) Fat 11g (17%) Saturated Fat 4g (20%) Cholesterol 22mg (7%) Sodium 178mg (7%) Fiber 2g (8%) Sugar 20g (40%)

Nutrition Facts

Serving: 36Cookies (2 to 3 Dozen Depending on Size)

Amount Per Serving

Calories

% Daily Value*

Serving 1 Cookie
Calories 224kcal 11%
Carbohydrates 28g 9%
Protein 5g 10%
Fat 11g 17%
Saturated Fat 4g 20%
Cholesterol 22mg 7%
Sodium 178mg 7%
Fiber 2g 8%
Sugar 20g 40%

* Percent Daily Values are based on a 2,000 calorie diet.