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Loaded Chewy Chocolate Chip M&M Cookie Cake

This loaded chewy chocolate chip M&M cookie cake is everything you want in a dessert: thick, soft, and packed with melty chocolate in every bite. With a buttery base, hints of vanilla, and a mix of chocolate chips and candy pieces, it delivers a perfect balance of texture and sweetness. It’s simple to make but feels special enough for birthdays, gatherings, or anytime you want a crowd-pleasing treat.
Prep Time15 minutes
Cook Time30 minutes
Total Time45 minutes
Servings: 10

Ingredients

Cookie Cake Base

  • ¾ cup 12 tbsp salted butter, softened
  • ¾ cup light brown sugar packed
  • ¼ cup granulated sugar
  • 1 large egg room temperature
  • 1 egg yolk room temperature
  • 1 tablespoon vanilla extract
  • 2 cups all-purpose flour
  • 2 teaspoons baking powder

Mix-Ins

  • ½ cup semi-sweet chocolate chips
  • ¾ cup chopped chocolate candies or M&M-style pieces divided
  • ½ cup milk chocolate chips

Instructions

Preheat & Prep

  • Preheat oven to 350°F. Lightly grease a 9-inch round baking dish or pie pan.

Mix Dry Ingredients

  • In a bowl, whisk together flour and baking powder. Set aside.

Cream Butter & Sugar

  • In a large bowl, beat butter, brown sugar, and granulated sugar until smooth and creamy.

Add Eggs & Vanilla

  • Mix in the egg, egg yolk, and vanilla until just combined.

Combine Wet & Dry

  • Gradually add dry ingredients into the wet mixture. Stir until a soft dough forms. Do not overmix.

Fold in Chocolate

  • Gently fold in most of the chocolate chips and candy pieces, reserving a small portion for topping.

Shape the Dough

  • Press the dough evenly into the prepared pan.

Add Toppings

  • Sprinkle the remaining chocolate and candy pieces over the top, pressing lightly.

Bake

  • Bake for 25–30 minutes until edges are golden and the center is set but still soft.
  • (Cover loosely with foil halfway through if the top browns too quickly.)

Cool & Serve

  • Let cool completely before slicing, or serve slightly warm for a gooey texture.

Notes

  • Don’t overbake: The center should look slightly underdone when you remove it from the oven. It will firm up as it cools.
  • Use room temperature ingredients: This helps everything blend smoothly.
  • Customize flavors: Swap M&Ms with chopped peanut butter cups or white chocolate chunks.
  • Storage: Keep covered at room temperature for up to 3 days or refrigerate for longer freshness.
  • Reheating: Warm slices in the microwave for 10–15 seconds for a fresh-baked feel.