Guinness Cupcakes with Espresso Frosting Recipe

Ingredients

• 1 (12 fluid ounce) can or bottle Irish stout beer (such as Guinness®)
• 4 tablespoons unsalted butter
• 1/2 teaspoon vanilla extract
• 2 cups all-purpose flour
• 2 cups white sugar
• 3/4 cup unsweetened cocoa powder
• 1 1/4 teaspoons baking soda
• 1 teaspoon salt
• 3/4 cup sour cream
• 3 eggs
• 3 cups powdered sugar
• 1/3 cup unsalted butter, cubed and softened
• 3 tablespoons water
• 1 1/2 teaspoons instant espresso powder