best easy champagne cupcakes

Ingredients For best easy champagne cupcakes

• 1 2/3 c

  all purpose flour
• 1 c

  sugar
• 1/4 tsp

  baking soda
• 1 tsp

  baking powder
• 3/4 c

  salted butter, room temperature
• 3 lg

  egg whites
• 1 tsp

  vanilla extract
• 1/2 c

  sour cream
• 1/2 c

  + 2 tbsp champagne
• 1/2 c

  butter
• 1/2 c

  shortening
• 4 c

  powdered sugar
• 4-5 tsp

  champagne