30min · 14 servings 1 ¼ cups all-purpose flour ¼ cup cornstarch 1 tablespoon natural unsweetened cocoa powder ¼ teaspoon salt 2 ounces (½ stick) butter - softened at room temperature 1 cup sugar 1 large egg ¾ cup buttermilk (see alternative) ½ cup canola or vegetable oil 2 teaspoons vanilla extract red food coloring (liquid or gel) ½ teaspoon baking soda ½ teaspoon white vinegar cream cheese frosting (just make half of the recipe)