Step 1

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 over the flour and sugar. Mix thoroughly.

Step 2

Add buttermilk, eggs, baking soda, vanilla, and marshmallows and mix well.

Step 3

Bake in a prepared 9 by 13 inch pan for 40 minutes at 350 degrees F (175 degrees C).

Step 4

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.