Strawberry Champagne Cupcakes

Name: Strawberry Champagne Cupcakes
Prep time: 40 min
Cook time: 20 min
Total time: 1 h
Cuisine: American
Ingredients: 1 cup champagne; 8 Tablespoons unsalted butter, at room temperature (115g); 1 3/4 cups powdered sugar (210g); 1/2 teaspoon vanilla extract; 3 strawberries, diced (optional); 1/2 cup jam; 3/4 cup sugar (167g); 6 Tablespoons unsalted butter, at room temperature (85g); 1 1/3 cups all-purpose flour (175g); 2 teaspoons baking powder; 1/4 teaspoon salt; 1 egg; 1 egg white; 1 teaspoon vanilla extract; 2/3 cup champagne (160 ml)