Step 1

Preheat oven to 350 degrees and line pan with cupcake liners.

Step 2

In a large bowl, sift in cake mix.

Step 3

Add melted butter, eggs, vanilla extract, milk and sour cream. Stir until well combined and smooth.

Step 4

Stir in mini chocolate chips.

Step 5

5 Fill cupcake liners 3/4 full and bake for 15-20 minutes or until an inserted knife comes out clean.

Step 6

Let cool.

Step 7

Brownie Batter Frosting: Beat butter. Add brownie mix, cocoa powder, vanilla and milk and beat again. Slowly add in powdered sugar until you reach your desired consistency. Add more milk if it becomes too thick. Taste as you go, feel free to add more cocoa powder or brown mix to get your desired taste!

Step 8

Pipe onto cooled cupcakes and top with brownie pieces!