Step 1

Preheat the oven to 350 degrees F (175 degrees C). Grease a 9x13-inch baking pan.

Step 2

Mix cake mix, butter, 2 eggs, and vanilla extract in a bowl. Pat into the prepared pan.

Step 3

Mix cream cheese, cocoa powder, and remaining eggs together in another bowl with an electric mixer. Beat in powdered sugar slowly. Pour over cake layer in the pan.

Step 4

Bake in the preheated oven until a toothpick inserted into the center comes out clean, about 45 minutes. Let cool.