01 -
Preheat oven to 350°F. Grease a 9x3-inch round cake pan; then, line the pan with parchment paper. (You could also use GOOP*, a homemade pan release.)
02 -
In a large bowl, combine the cake mix, 1 egg (reserving the other 2 eggs for later), and 1 stick of melted butter. Stir until well blended.
03 -
Pour the mixture into the prepared pan, gently patting it down, and set aside.
04 -
In the bowl of a stand mixer on medium speed (or using a hand-held mixer), beat the cream cheese until smooth. Add the remaining 2 eggs and the cocoa powder.
05 -
Reducing the mixer to low speed, add the confectioners' sugar. Slowly add the remaining stick of melted butter. Add vanilla and continue to beat the mixture until smooth.
06 -
Pour the filling into the pan, over the cake mixture. Bake for 40-50 minutes, being careful not to overbake the cake. The center should still be a little gooey when finished baking.
07 -
Let the cake partially cool on a wire rack before cutting and serving.