Preheat your oven to 375°F (190°C).
In a large mixing bowl, combine the flour, sugar, baking powder, and salt.
Pour the beer into the dry ingredients and mix until just combined.
Transfer the dough to a greased loaf pan.
Pour the melted butter over the top of the dough.
Bake for 45 minutes or until golden brown.
Check for doneness by inserting a toothpick; it should come out clean.
Remove from the oven and let it cool in the pan for 10 minutes.
Transfer the bread to a wire rack to cool completely.
Slice and serve warm or at room temperature.