Coca-cola? Cake

*Diet Coca-Cola will not work in this recipe.

To make cake, preheat oven to 350?F. Lightly coat a 9×13-inch baking pan
with vegetable cooking spray and dust with flour. In a large bowl, combine
the flour, brown sugar and granulated sugar. In a heavy, medium saucepan
over low heat combine the butter, Coca-Cola and cocoa and heat until the
butter has melted, stirring often. In crease the heat to medium-high and
bring just to a boil, stirring often. Remove from the heat and pour over
the flour mixture in the bowl, whisking constantly until well blended and
smooth. Whisk in the buttermilk, eggs, baking soda and vanilla until well
blended. Stir in the marshmallows. Pour the batter into the prepared pan.
Bake until a toothpick inserted in the center comes out clean with just a
few crumbs adhering to it, 30 to 35 minutes. When baked, the cake top will
have a crater-like surface where the marshmallows have melted. Let the cake
cool completely in the pan on a wire rack.

To make the icing, in the top of a double boiler, set over simmering–not
boiling–water over low heat, melt the chocolate and butter, stirring
constantly. Remove from heat and whisk in the Coca-Cola and corn syrup
until well blended. Set aside to cool to room temperature. Then spread the
cooled icing in an even layer over the top of the cake. Sprinkle with the
marshmallows. To serve, cut into squares and serve directly from the baking
pan.