2 Melt the butter. Mix the flour and baking powder in a bowl. Whisk together the egg, sugar, melted butter, buttermilk, sour cream and caramel sauce. Quickly mix in the dry ingredients with an electric hand mixer. Divide the mixture between the holes of the prepared muffin pan and bake in the preheated oven for about 20 minutes. Take out and let rest in the pan for 5-10 minutes, then take out of the pan and cool on a cake rack.