Best monster cookie recipe! This easy flourless monster cookie recipe is made with oats, peanut butter, and M&M’s.
Monster cookies are one of those fun recipes that throws all kinds of good stuff in for a cookie that’s packed with deliciousness.
The base for these cookies is a simple oatmeal peanut butter dough. You may notice that there’s no flour listed in the ingredients. It isn’t a typo; there’s no flour necessary for these cookies.
I use M&M’s and mini chocolate chips in these cookies, but other mix-in ideas are given below.
What are monster cookies?
Monster cookies are oatmeal peanut buter cookies that have M&M’s, chocolate chips, and other mix-ins.
How to make monster cookies
Begin by beating butter and sugars together in a mixing bowl until well-combined.
Next, mix in the eggs one at a time until combined.
Next, mix in the peanut butter and vanilla until combined. Creamy or crunchy peanut butter works, but I haven’t tried using natural peanut butter in this recipe.
Then, stir in the oats, baking soda, and salt.
Finally, mix in the M&M’s, chocolate chips, and any other mix-ins.
Since there isn’t any flour in this recipe, the dough will be sticky. There is no need to flatten the cookies before baking; they will spread as they bake.
What else can I add?
You can swap raisins, coconut, chopped nuts, flavored baking chips, and more for part of the M&M’s and/or chocolate chips.
Can the dough be frozen?
It can! To freeze the dough, I place scoops of dough on a baking sheet and then freeze until solid.
Then, I place the frozen scoops of dough in a resealable bag.
When baking the frozen dough, add about 2-3 minutes to the baking time (time will vary from oven to oven).
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Easy monster cookie recipe.
- 1 cup brown sugar packed
- 3/4 cup granulated sugar
- 1/2 cup butter at room temperature
- 3 large eggs
- 1 1/2 cups peanut butter¹
- 1 tablespoon vanilla extract
- 2 teaspoons baking soda
- 1 teaspoon kosher salt²
- 4 1/2 cups oats³
- 1 1/4 cups M&Ms
- 1 cup mini semisweet chocolate chips
Pre-heat the oven to 350F. Line two baking sheet with parchment paper or silicone baking mats. Set aside.
In the bowl of a stand mixer fitted with the paddle attachment, cream together the sugars and butter until light and fluffy, about 3 minutes on medium.
Mix in the eggs, one at a time.
Beat in the peanut butter and vanilla until well combined.
Add the the baking soda, kosher salt, and oats. Stir in until combined
Stir in the M&Ms and mini chocolate chips just until incorporated.
Scoop 1.5 tablespoon scoops (medium cookie scoop) of the dough about 2 inches apart onto the prepared baking sheets
Bake for 8-12 minutes.
Let cookies cool on baking sheet for 5 minutes.
Remove to wire cooling rack to finish cooling.
- Creamy or crunchy ok. I haven't tried this recipe with natural peanut butter.
- Or 1/2 teaspoon table salt
- Old-fashioned or quick oats ok.
- Nutrition values are estimates.