Wedding Cupcakes with Champagne Frosting

Bahan-bahan (14 porsi)

• 1 and 3/4 cups (207g) cake flour* (spooned & leveled)
• 3/4 teaspoon baking powder
• 1/4 teaspoon baking soda
• 1/4 teaspoon salt
• 1/2 cup (8 Tbsp; 113g) unsalted butter, softened to room temperature
• 1 cup (200g) granulated sugar
• 3 large egg whites, at room temperature
• 2 teaspoons pure vanilla extract
• 1/2 cup (120g) full-fat sour cream at room temperature*
• 1/2 cup (120ml) your favorite champagne
• 3/4 cup (180ml) your favorite champagne
• 1 cup (16 Tbsp; 226g) unsalted butter, softened to room temperature
• 4 cups (480ml) confectioners’ sugar
• 1 teaspoon pure vanilla extract
• optional: gold glitter sprinkles