grease a 9 by 5 inch loaf pan and line with parchment.
Mix batter
whisk dry ingredients until uniform
whisk wet ingredients until smooth
add wet to dry and fold just until no dry flour remains
fold in cheddar Parmesan and herbs and stop mixing as soon as combined.
Bake and finish
scrape batter into pan and smooth top
add extra cheddar on top if using
bake until deep golden and a toothpick inserted in the center comes out clean or with a few moist crumbs
cool in pan 10 minutes then transfer to a rack
brush warm loaf with melted butter and cool at least 20 minutes before slicing.
Notes
1. Use Greek yogurt thinned with milk instead of buttermilk. Swap herbs with dill basil or oregano based on what is fresh. For a spicier loaf add 0.5 tsp cayenne or 1 diced jalapeno. If browning too fast tent with foil for the last 15 minutes