(15.25-ounce) box vanilla or white cake mix For the cake ... at least 1 hour and up to 12 hours. For the decorations: In a medium microwave-safe bowl, melt the candy melts in the microwave ...

(15.25-ounce) box vanilla or white cake mix sparkling sparkling wine (such as champagne, prosecco or cava), at room temperature large eggs vegetable oil For the Champagne Buttercream: Tip: The cake ...