Brownie Birthday Cake

This Brownie Birthday Cake is the perfect way to celebrate- decadent layers of brownie (instead of cake) with chocolate fudge frosting and sprinkles! It's perfect for any brownie lover!

Course Dessert

Cuisine American

Prep Time 20

Cook Time 30

chill time 2

Total Time 3

Servings servings

Calories 572kcal

Author Kelly Hamilton

Cost $5

Equipment

Ingredients

1¼ cup unsalted butter melted
2½ cup light brown sugar packed
4 large eggs at room temperature
2 teaspoon vanilla extract
1½ cups cocoa powder
¾ cup all-purpose flour spooned and leveled
¾ teaspoon salt

Icing

5 tablespoon unsalted butter at room temperature
½ cup cocoa powder + 2 tbsp
2½ cups powdered sugar
⅓ cup milk
1 teaspoon vanilla extract
rainbow sprinkles optional

US Customary - Metric

Instructions

Preheat the oven to 350° F. Spray two 8-inch round cake pans with non-stick spray and line the bottom with parchment paper. Set aside.
In a large microwave-safe bowl, melt the butter. Add in the brown sugar and whisk until fully combined. Add in the eggs, one at a time, whisking in between. Then add the vanilla extract.
Mix in the cocoa powder, flour, and salt until just combined and no streaks remain. The batter will be thick.
Pour the batter equally into the two prepared pans. Bake in the oven for 30-35 minutes, or until a toothpick inserted into the center comes out clean. Allow the brownies to cool in the pan for about 10 minutes, run a sharp knife around the edges to release the brownies, and then flip them onto a wire cooling rack to cool completely.
To make the fudge frosting, use an electric mixer to beat the butter until smooth. Add in the cocoa powder, powdered sugar, milk, and vanilla, mixing on low until combined. Increase speed to medium and beat for another minute until smooth. If the frosting is too thick, add 1 teaspoon of milk at a time until you reach the desired consistency.
Once the brownie layers have cooled completely, place one layer onto a cake plate and top it with half the frosting (and sprinkles if using). Add the second brownie layer on top, followed by the rest of the frosting and sprinkles.

Notes

Let the brownie layers cool completely before assembling, otherwise, the fudge frosting might melt right off!
I recommend ensuring your ingredients are at room temperature before starting, especially your eggs.
Make sure to measure your flour correctly! While we want the brownie layers to be cakey, we don’t want them to be dry and make your brownies crumbly.
These are my favorite sprinkles to use!

Nutrition