Heat the oven to 450°F
Place the butter in an 8-inch square baking pan and melt it in the oven while it heats until just melted
Whisk together the flours, sugar, baking powder, salt, garlic powder, Old Bay, onion powder, and cheese in a large bowl
Pour the milk into the flour mixture and fold with a flexible spatula until combined—the dough will be wet and a little loose
Scrape the biscuit dough into the melted butter-filled pan and pat it evenly over the butter
Roughly cut the dough into nine equal-size biscuits with a bench scraper or knife
Bake for about 20 minutes, or until the tops of the biscuits are nicely browned
Remove from the oven and sprinkle the biscuits with the extra ¼ teaspoon of Old Bay
Let them cool in the pan for about 5 minutes before serving
