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