Champagne Cake Recipe

Ingredients

• 2 cups champagne
• CAKE:
• 2-1/2 cups all-purpose flour
• 3-1/2 teaspoons baking powder
• 1/2 teaspoon salt
• 1-3/4 cups sugar
• 3/4 cup butter, softened
• 1/3 cup sour cream
• 6 egg whites, room temperature
• 1 teaspoon vanilla extract
• 3/4 cup whole milk
• FROSTING:
• 1 cup butter, softened
• 9 cups confectioners' sugar
• 2 tablespoons champagne
• 2/3 to 3/4 cup whole milk
• White, silver or gold sprinkles, for decorating