Monster Cookie Bars
These thick, chewy monster cookie bars are packed with peanut butter, chocolate chips, and M&Ms—just like the classic cookie, but way easier. No chilling or scooping needed!
Equipment
Ingredients
- 14 tablespoons unsalted butter room temperature
- 1/2 cup creamy peanut butter
- 1/2 cup light brown sugar packed
- 1/2 cup dark brown sugar packed
- 1/2 cup granulated sugar
- 2 large eggs room temperature
- 2 large egg yolks room temperature
- 1 tablespoon vanilla extract
- 2 cups all-purpose flour *See notes below for measuring*
- 1 3/4 cup rolled oats (old-fashioned oats)
- 1/2 cup semi-sweet chocolate chips
- 1/2 cup chopped chocolate bar
- 1/3 cup mini M&Ms
- 1/3 cup regular M&Ms
- 1 teaspoon baking soda
- 1 teaspoon fine sea salt
Instructions
- Line a 9x13 baking pan with parchment paper or grease the sides and bottom with nonstick spray or butter. Then preheat the oven to 350 F/180 C.
- In a mixing bowl, cream the butter, peanut butter, brown sugar, and granulated sugar until light and fluffy.
- Mix in the eggs, egg yolks, and vanilla.
- Fold in the flour, oats, baking soda, salt, chocolate chips, chopped chocolate, and M&Ms until just combined. Do not overmix! Evenly spread the cookie dough into the prepared baking pan. Sprinkle the top with extra chocolate chips, chopped chocolate, and M&Ms if desired.
- Bake in the preheated oven for 25-35 minutes or until the top is golden brown and a toothpick inserted into the center comes out just barely moist. Let them cool completely on a wire rack before cutting then enjoy!
Video
Notes
*Measure your flour properly. This is my #1 baking tip! Do not ever scoop a measuring cup into your flour as this always leads to using too much flour. Instead, use the spoon-level method. This means fluffing the flour first, then spooning it into your measuring cup/spoon. For the BEST results, use a kitchen scale!*
