Guinness cupcakes * 1 bottle Guinness  * 1/2 cup milk * 1/2 cup vegetable oil * 1 tablespoon pure vanilla extract * 3 large eggs * 3/4 cup sour cream * 3/4 cup unsweetened cocoa powder * 2 cups granulated sugar * 2 1/2 cups all-purpose flour * 1 1/2 teaspoons baking soda Instructions