INGREDIENTS
1/4 tsp
baking powder
1/2 tsp
baking soda
1/2 cup
butter
1/2 cup
champagne
1 cup
champagne
2 1/2 cups
confectioners' sugar
2 tbsps
cornstarch
2
egg yolks
2
eggs
1 3/4 cups
flour
1 cup
granulated sugar
1/2 cup
heavy cream
1/4 tsp
salt
1/2 cup
sour cream
1/2 cup
sparkling wine
2 tbsps
unsalted butter
1 tsp
vanilla
1
whole egg