Good-Cooking - Crater Cake with Cola Frosting

Ingredients

• 2 cups all-purpose flour
• 2 cups granulated sugar
• 1 cup butter or margarine
• 3 tablespoons cocoa
• 1 cup cola carbonated beverage
• 1/2 cup buttermilk
• 2 eggs, beaten
• 1 teaspoon baking soda
• 1 teaspoon vanilla extract
• 1/2 teaspoon salt
• 2 cups miniature marshmallows