Yummy
Combine flour and sugar in large bowl.
Heat butter, cocoa and Coca Cola to boiling point; pour over sugar mixture.
Mix buttermilk, eggs, baking soda, marshmallows and vanilla and add to mixture. Mix well. Batter will be thin.
Pour into a greased and floured 9x13-inch pan and bake 30 minutes at 375 degrees F.
Frosting: Combine margarine, cocoa and Coca-Cola and heat to boiling.
Pour over sugar.
Blend with mixer until smooth; add nuts and vanilla.
Pour over cake while frosting is still hot. Cool and cut into squares.
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