Preheat oven to 375 degrees. Butter and lightly flour a 9 x 5-inch loaf pan; set aside.

In a large bowl, combine sifted (do not skip this step) flour, baking powder, sugar, salt and beer; stir until just combined.

Pour batter into the prepared loaf pan. Pour melted butter over the top and bake for 55-60 minutes until golden brown. Cool for 15 minutes before serving. Slice and serve with butter.