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["Place rack at the top of oven with enough head room for a 9""x9"" casserole dish.", "Grease the sides of a 9""x9"" square casserole dish with cooking spray.", "Add melted butter, hash browns, and chopped onion to dish.", "Mix until hash browns and onions are well-coated.", "Distribute mixture evenly over bottom of dish.", "Broil hash brown mixture for 5-10 minutes or until golden brown.", "Carefully remove the hot dish from the oven and set aside.", "Move rack to center of oven.", "Set oven to 350 degrees F.", "(Optional) Unwrap American cheese slices and place side-by-side in two rows on top of the hash brown mixture.", "(This will make the final casserole gooier in the middle.", ").", "Sprinkle the ham and bacon pieces evenly over hash browns.", "Sprinkle the cheddar and jack cheeses evenly over the meat.", "In a medium-sized mixing bowl, add eggs, milk, salt, onion powder, black pepper, and celery salt.", "Stir until combined.", "Slowly pour egg mixture over casserole dish contents to distribute the mixture evenly and minimize shifting of other ingredients.", "Bake, uncovered for 45 minutes or until top of casserole begins to brown and a knife inserted toward the center comes out clean.", "Remove from oven and let cool for 5 minutes before serving.", "Store leftovers in a sealed container in the refrigerator for up to 3 days."]
