Coca Cola Cake

This is a VERY rich and sweet dessert (and not low fat in way, shape or form) but it is SO good!

Ingredients for cake:
1 cup coke
1/2 cup buttermilk
1 cup butter, softenened
1 3/4 cups sugar
2 large eggs, slightly beaten
2 tsp vanilla extract
2 cups all purpose flour
1/4 cup unsweetened cocoa
1 tsp baking soda
1 1/2 cups miniature marshmallows

Preheat oven to 350. Combine coke and buttermilk. Beat butter at slow speed with an electric mixer until creamy. Gradually add sugar, beating until blended. Add eggs and vanilla/ beat at low speed until blended.
Combine flour, cocoa, and baking soda. Add to butter mixture alternately with coke mixture, beginning and ending with flour mixture. Beat at low speed until blended after each addition. Stir in marshmallows. Pour batter into a greased and floured 13x9 inch pan.
Bake at 350 for 30 to 35 minutes. Remove from oven. Cool for 10 minutes.
Pour Classic Coke frosting over warm cake. (Sprinkle with toated pecans - optional)

Classic Coke Frosting (the best part)
1/2 cup butter
1/3 cup coke
3 tbsp unsweetened cocoa
1 16 oz pkg powdered sugar
1 tbsp vanilla extract

Bring first 3 ingredients to a boil in a large saucepan over medium heat, stirring until butter is melted. Remove from heat; whisk in sugar and vanilla. Use immediately.