INGREDIENTS
1
Box white cake mix
1/3 cup
oil
4
egg whites
3/4 cup
buttermilk
3/4 cup
sour cream
2 tsp
vanilla extract
3/4 cup
butter, softened
4 oz
cream cheese, softened
3/4 cup
unsweetened cocoa powder
1 1/2 tsp
vanilla extract
3 cups
powdered sugar
milk if needed