Combine flour and white sugar in mixing bowl.Heat 1 cup butter, 3 tablespoons cocoa, and 1 cup cola soft drink to boiling and pour overthe flour and sugar.Mix thoroughly.
Add buttermilk, eggs, baking soda, vanilla, and marshmallows and mix well.
Bake in a prepared 9 by 13 inch pan for 40 minutes at 350 degrees F (175 degrees C).
While still hot, frost with Coco Cola Frosting:Combine 1/2 cup butter or margarine, 2 tablespoons cocoa and 6 tablespoons cola soft drink and heat to boiling.Pour over 4 cups confectioners’ sugar and mix well. Mix in chopped nuts and spread over hot cake.
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