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Cake:
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Preheat oven to 350u00b0F.
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Spray a 9x13 glass pan with nonstick spray.
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Combine flour, granulated sugar and baking soda in mixing bowl.
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In a small saucepan, heat 1 cup butter, 5 tablespoons cocoa and 1 cup cola beverage to boiling. (whisk together as it melts).
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Pour over the flour mixture and mix thoroughly. I just use a whisk for this because it comes together so easily.
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Add buttermilk, eggs and vanilla. Mix well.
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Pour into prepared 9x13 pan.
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Bake for 40 minutes.
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During last 10 minutes of baking prepare frosting.
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Prepare Second Frosting:
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Place 5 cups confectioners' sugar in a mixing bowl.
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In a small saucepan, combine 1/2 cup butter, 3 tablespoons cocoa powder and 9 tablespoons cola beverage. Whisk together. Heat to boiling.
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Remove from heat, stir in 1 teaspoon vanilla.
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Pour over 4 cups confectioners' sugar.
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Mix well with a whisk.
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Assembly:
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Remove cake from oven.
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Immediately frost with marshmallow cream. Go slow. This will prevent tearing the cake. As the fluff warms a bit it will spread easily.
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Slowly pour warm coco-cola frosting over marshmallow fluff.
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It's best to let this cake cool for about an hour before cutting into it.
