Preheat oven to 350F/177C. Generously grease an 8"x4" loaf pan with butter.
In a large bowl combine flour, baking powder, salt, cheddar cheese and Parmesan cheese. Make a well in the center.
Pour milk into well and stir slightly. Add melted butter and mix until just combined. Do not over mix. Spread batter into prepared pan and bake 50-55 minutes or until lightly browned and toothpick inserted comes out clean.
Brush top with a little melted butter. Cool 10 minutes in pan before transferring to rack to cool completely.