Coke Sheet Cake - Add the powdered sugar and stir until smooth. In a small saucepan, combine cola, butter and cocoa; In a large bowl, whisk the first 5 ingredients. Add soda, butter and cocoa powder to a large pot and bring to a boil, whisking well. Web make the cake: Pour over warm cake and let cool until the frosting crusts. Once boiling, pour the coke mixture over the flour mixture. Whisk flour, sugar, cocoa, baking soda, salt, and coffee granules in a large bowl. Spray a 10x15 sheet cake pan with cooking spray (i like the kind with flour). Whisk together the sugar and flour.
Spray a 10x15 sheet cake pan with cooking spray (i like the kind with flour). Whisk together the sugar and flour. Pour over warm cake and let cool until the frosting crusts. Add soda, butter and cocoa powder to a large pot and bring to a boil, whisking well. In a small saucepan, combine cola, butter and cocoa; In a large bowl, whisk the first 5 ingredients. Web make the cake: Bring just to a boil, stirring occasionally. Whisk flour, sugar, cocoa, baking soda, salt, and coffee granules in a large bowl. Place butter, cocoa and cola in a saucepan and heat until boiling. Add the powdered sugar and stir until smooth. Preheat the oven to 350 degrees and spray a 9x13 baking pan with baking spray. Once boiling, pour the coke mixture over the flour mixture.