Preheat your oven to 375°F (190°C).
Grease a 9x5-inch loaf pan.
In a large bowl, mix the flour, baking powder, salt, and sugar.
Gradually pour in the beer, stirring until just combined.
Pour the batter into the prepared loaf pan.
Drizzle the melted butter over the top of the batter.
Bake for 50-60 minutes or until golden brown and a toothpick comes out clean.
Allow the bread to cool in the pan for 10 minutes.
Remove from the pan and cool on a wire rack.
Slice and serve warm or at room temperature.