Name: Monster Cookies
Prep time: 10 min
Cook time: 30 min
Total time: 40 min
Yield: 20 Cookies
Cuisine: American

Real Life of Lulu Verified

January 22, 2026

Meet the vintage kitchen-sink cookie packed with chewy oats, rich peanut butter, and melty chocolate under a confetti of mini M&Ms. They bake up bakery-big with crisp edges and soft centers that vanish the second they’re cool enough to grab. I press a few extra candies on top before baking for extra color.

From the Cook

1/8

Monster Cookies

Real Life of Lulu Verified

Ingredients

WarningMilk and 6 other allergens identified

Instructions

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Instructions

Preheat oven to 350℉. Line cookie sheets with parchment paper and set aside.

Cream the butter, brown sugar, and white sugar in a large mixing bowl with an electric mixer until light and fluffy.

Add the eggs one at a time and beat until incorporated.

Use a mixer to beat in the peanut butter, corn syrup, and vanilla and mix well.

Stir in the flour, baking soda, and oats.

Fold in the mini M&Ms and mini chocolate chips just until combined.

Each cookie is 3 tablespoons in size. Drop 3 tablespoons of dough right next to each other and squish them together to form one cookie. I flattened mine for a larger, flatter cookie. You can keep them mounded for a softer cookie.

Space cookies 2 inches apart.

Bake at 350℉ for 9-12 minutes.

Press a few M&Ms into the top of each cookie right away, if desired.

Let the cookies cool on the cookie sheet for 5-10 minutes before moving to a cooling rack.