A chocolate devils food cake mix is doctored up to make a moist, delicious semi-homemade chocolate cake that is a perfect ending to dinner or for special occasions.
Spray the inside of the 2 cake pans with cooking spray and line with a circle of parchment paper; set aside.
Add the cake mix, flour, and cocoa powder to a large bowl and stir with a wire whisk until combined.
Add the eggs, oil, water, and vanilla to the dry ingredients. With an electric hand mixer on a medium setting, mix the ingredients until thoroughly blended.
Using a silicone spatula, fold in the sour cream.
Evenly distribute the cake batter into the greased cake pans.
Bake for 30 minutes, or until a toothpick inserted in the center of the cake comes out clean.
Remove the cake from the oven and cool completely on a wire rack.
For the frosting
In a large bowl, mix the powdered sugar and cocoa powder until combined, set aside.
In a separate large mixing bowl use an electric hand mixer to cream the butter.
Using a low speed, mix the vanilla extract, ¼ milk, and ¾ cup of the cocoa mixture into the butter.
Continue adding the cocoa mixture and milk alternately until the frosting forms a smooth and creamy texture throughout.