These are the best monster cookies ever! They’re deliciously packed with peanut butter, oats, M&Ms, and chocolate chips. No bite is boring! The cookies are soft-baked style and extra thick. No cookie dough chilling required, so this cookie recipe is simple and quick!
- 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
- 3/4 cup (185g) creamy peanut butter
- 1 large egg, at room temperature*
- 1 teaspoon pure vanilla extract
- 1/2 teaspoon baking soda
- 1 and 1/4 cups (156g) all-purpose flour (spoon & leveled)
- 1/2 cup (43g) quick oats*
- 3/4 cup (150g) M&Ms (any size or variety)
- 1/2 cup (90g) semi-sweet chocolate chips
- Preheat oven to 350°F (177°C). Line baking sheet with parchment paper or silicone baking mat.
- In a large bowl, using a hand-held mixer or stand mixer with paddle attachment, cream the butter and sugars together on medium speed, about 3 minutes. Mix in the peanut butter, egg, and vanilla (in that order). Scrape down the sides of the bowl as needed. Slowly mix in the baking soda and flour. Do not over-mix. On low speed, beat in the quick oats, M&Ms, and chocolate chips just until incorporated. If the dough is very soft and unmanageable by hand, chill the dough for 30 minutes before rolling.
- Rolls balls of dough, about 2 Tablespoons of dough per ball, onto prepared baking sheet. Press a few extra M&Ms on top for looks, if preferred. Bake for 11-13 minutes– the cookies will still look a little soft, which is recommended. Slightly press down the baked cookies with the back of a spoon, since the cookies only slightly spread in the oven. Allow cookies to cool on baking sheet for 10 minutes before transferring to a wire rack. Cookies will firm up as they cool.
- Store cookies covered at room temperature for up to 1 week.
- Freezing Instructions: Baked and cooled cookies freeze well for up to 3 months. Unbaked cookie dough balls freeze well for up to 3 months too. Bake frozen cookie dough balls for an extra minute, no need to thaw. Read my tips and tricks on how to freeze cookie dough.
- Special Tools (affiliate links): Stand Mixer or Handheld Mixer | Baking Sheets | Silicone Baking Mats or Parchment Paper | Cooling Rack
- You can use unsalted butter in this recipe. If so, add 1/4 teaspoon salt with the flour.
- Peanut Butter: While it’s great for cooking and eating, natural style peanut butter isn’t ideal for these cookies. They will turn out too dry and crumbly. I do not recommend crunchy style peanut butter for that same reason. I recommend processed creamy peanut butter such as Jif or Skippy.
- Use quick oats in this recipe. Quick oats are more finely cut whole oats and will give the monster cookies a more uniform texture. Furthermore, quick oats act more as a binder since the consistency is more powdery. If you don’t have quick oats, pulse your whole oats in the food processor a few times to break them down.
- Looking for a recipe without peanut butter? Here are my Chewy Oatmeal M&M Cookies.
- Why is everything at room temperature? All refrigerated items should be at room temperature so the batter mixes together easily and evenly. Read here for more about the importance of room temperature ingredients.
- Be sure to check out my top 5 cookie baking tips AND these are my 10 must-have cookie baking tools.
Keywords: cookies, oatmeal cookies, monster cookies