Best Champagne Cake Recipe - How To Make Champagne Cake

Ingredients

• Cooking spray
• 1 1/4 c. all-purpose flour
• 1/4 c. cornstarch
• 2 tsp. baking powder
• 1/2 tsp. kosher salt
• 3 large egg whites, at room temperature
• 2/3 c. Champagne or Prosecco, at room temperature
• 1 tsp. pure vanilla extract
• 1 1/3 c. granulated sugar
• 3/4 c. (1 1/2 sticks) butter, softened
• 1 tsp. lemon zest
• Sanding sugar, for garnish
• 5 c. powdered sugar
• 1 1/2 c. (3 sticks) butter, softened
• 1/4 c. sour cream
• Pinch of kosher salt
• 1 c. chopped strawberries