1 c. butter (soft)
2 c. flour
1 1/4 c. sugar
3 tbsp. cocoa
1 tsp. baking soda
1 tsp. vanilla
1/2 c. buttermilk
1 c. coke
1 c. mini marshmallows

Blend together in large mixer bowl. Add all ingredients, except coke and marshmallows. Mix in coke and marshmallows by hand. Pour into 13x9 greased and floured cake pan. Bake in preheated oven 350 degrees 40 to 45 minutes. Cool for 30 minutes. Then frost cake with coke icing.