01 -
Whip your softened butter in a mixing bowl for 2-3 minutes until fluffy. Slowly mix in the powdered sugar on low so it doesn’t fly everywhere. Pour in champagne, a pinch of salt, and vanilla extract, then crank the speed to medium-high for about 3-5 minutes until creamy and airy. Add some pink food gel for color, if you like.
02 -
Heat your oven to 350°F. Get three 6-inch pans ready by lining them with parchment and coating them with either butter and flour or baking spray.
03 -
Stir together your flour, baking powder, and salt in a medium-sized bowl until everything’s mixed evenly.
04 -
Beat the softened butter and sugar for 2-3 minutes until it’s pale and fluffy. Blend in vanilla and then add the egg whites, one by one, ensuring everything gets mixed fully. Scrape down the sides of your bowl as needed.
05 -
Beginning with the dry mix, alternate adding it with the champagne to the butter mixture. Add in this pattern: dry mix, champagne, dry mix, champagne, then the last dry mix. Don’t overmix; stop as soon as it’s combined. Add pink coloring right after the second flour addition if using.
06 -
Evenly portion the cake batter into the prepared pans. Smooth the top with a spatula and bake for 25-30 minutes. They’re ready when a toothpick inserted in the center comes out with just a couple crumbs. Cool the cakes in the pans for 10 minutes, then transfer them to a rack to cool completely.
07 -
Once your cakes are cool, stack the layers with the prepared buttercream in between. For extra flair, drizzle white chocolate on top, arrange chocolate-coated strawberries, or garnish with champagne marshmallows.