– 1 package white or yellow cake mix – ½ cup salted butter softened – 3 large eggs – ¼ cup sour cream – 1 cup milk or buttermilk – 1 teaspoon vanilla extract
– 1 package chocolate cake mix – ½ cup salted butter softened – 3 large eggs – ¼ cup sour cream – 1 cup milk or buttermilk – 1 teaspoon vanilla extract
– 1 cup salted butter softened – ½ cup unsweetened cocoa powder – ½ cup hot water or heated heavy cream – 2 cups powdered sugar – 4 oz. German chocolate or semi-sweet baking bar, melted and cooled