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