Good-Cooking - Pepsi Cola Cake with Peanut Butter Frosting

Ingredients

• 2 cups all-purpose flour
• 2 cups granulated sugar
• 1/2 pound butter
• 2 tablespoons cocoa, unsweetened
• 1 cup Pepsi Cola
• 1/2 cup buttermilk
• 2 large eggs, beaten
• 1 teaspoon baking soda
• 1 teaspoon vanilla extract
• 1 1/2 cups miniature marshmallows