Champagne and Vanilla Bean Cake

Cake:

• 2 cups all-purpose flour
• 2 tsp baking powder
• 1/2 tsp salt
• 3/4 cup butter room temperature, unsalted
• 1 1/3 cup sugar
• 4 lrg egg white
• 1 1/3 cup champagne or sparkling wine
• 2 tsp vanilla extract or vanilla bean paste, high quality

Buttercream:

• 1 cup butter room temperature, unsalted
• 3 cups icing sugar
• 4-6 tbsp sparkling wine or champagne
• 2 tsp vanilla bean paste or quality vanilla extract

Assembly:

• 1 tbsp nonpareils or sprinkles