Delicious Copycat Cosmic Brownie Sheet Cake Easy Recipe with Rainbow Chips
A fudgy, rich brownie sheet cake with colorful rainbow chips that melt into a playful cosmic pattern. Easy to make with pantry staples and perfect for any occasion.
- Prep Time: 15 minutes
- Cook Time: 30 minutes
- Total Time: 45 minutes
- Yield: 12 servings 1x
- Category: Dessert
- Cuisine: American
Ingredients
Scale
- 1 cup (226g) unsalted butter, melted
- 1 ½ cups (300g) granulated sugar
- ¾ cup (65g) unsweetened cocoa powder, sifted
- ½ teaspoon salt
- 1 teaspoon baking powder
- 3 large eggs, room temperature
- 2 teaspoons pure vanilla extract
- 1 ½ cups (190g) all-purpose flour
- 1 cup (170g) rainbow chocolate chips
Instructions
- Preheat the oven to 350°F (175°C). Line a 9×13-inch pan with parchment paper or grease it lightly with butter.
- In a medium bowl, whisk together sifted cocoa powder, all-purpose flour, salt, and baking powder. Set aside.
- In a large bowl, whisk melted butter and granulated sugar until combined. Add eggs one at a time, whisking after each addition until smooth. Stir in vanilla extract.
- Gradually fold the dry mix into the wet ingredients with a spatula until just combined. Do not overmix.
- Fold in rainbow chips, reserving a small handful for topping.
- Pour batter into the prepared pan and spread evenly. Sprinkle remaining rainbow chips on top.
- Bake for 28–32 minutes. Check doneness with a toothpick; it should come out with a few moist crumbs.
- Cool completely on a wire rack before slicing.
Notes
Do not overmix the batter to keep it fudgy, not cakey. Use parchment paper for easy cleanup and neat slices. Tent with foil if edges bake faster than center. Let cake cool completely before slicing to avoid a gooey mess.
Nutrition
- Serving Size: 1 slice (1/12 of the
- Calories: 280
- Fat: 15
- Carbohydrates: 35
- Protein: 3
Keywords: brownie, cosmic brownie, sheet cake, rainbow chips, easy dessert, fudgy brownies, copycat recipe