Preheat air fryer, or oven to 350 degrees.
Mix beef, egg, panko, milk, garlic, salt and pepper together.
Spray the Pyrex dish with olive oil, and add 1/2 of the beef mixture.
Cook for one hour, removing in the last ten minutes to add 1 tbsp of mustard and ketchup to the top. Cook for 5 more minutes and add the last tbsp of ketchup to the top of the meatloaf, cooking for the final 5 minutes.