1Place baking paper in the base of the air fryer and spread out the waffle fries. Cook for 12 mins on 'max crisp' (240C/460F), shaking a couple of times.
2Add a drizzle of oil to a large pan over medium-high heat. Add the beef and break it up with your wooden spoon until browned.
3Stir in the flour, salt, garlic powder and black pepper, then stir in the stock and Worcestershire sauce. Continue frying and stirring until all the liquid gets soaked up and the beef is juicy.
4Combine sauce ingredients and adjust to preference if needed.
5Top the cooked fries with the beef, then sprinkle over the cheese. Cook for another 3-4 mins (air fryer at 190C/375F, oven at 180C/350F) or until the cheese melts.