Grapefruit Cupcakes and Frosting - Cupcakes by Amélie

Ingredients

• 1 1/4 sticks unsalted butter
• 4 oz. cream cheese
• 1 1/2 cups sugar
• 3 1/2 large eggs
• 1/2 teaspoon vanilla extract
• 1 tablespoon grapefruit juice
• 1 1/2 cups flour
• 2 tablespoons grapefruit zest
• 1/4 teaspoon baking powder
• 3/4 teaspoon salt
• FROSTING:
• 1 1/4 sticks butter, softened
• 1 pound powdered sugar
• 1 teaspoon vanilla extract
• 3 tablespoons fresh grapefruit juice
• 1 teaspoon grapefruit zest