Marble Cake

Ingredients (20)

• White Cake:
• 1 box white cake mix or yellow cake mix
• 1/2 cup salted butter softened
• 3 large eggs
• 1/4 cup sour cream
• 1 cup milk or buttermilk
• 1 teaspoon vanilla extract
• Chocolate Cake:
• 1 box chocolate cake mix
• 1/2 cup salted butter softened
• 3 large eggs
• 1/4 cup sour cream
• 1 cup milk or buttermilk
• 1 teaspoon vanilla extract
• Frosting:
• 1 cup salted butter softened
• 1/2 cup unsweetened cocoa powder
• 1/2 cup hot water or heated heavy cream
• 2 cups powdered sugar
• 4 ounces German chocolate or semi-sweet baking bar melted and cooled