Make 4 equal-sized patties from the ground beef.
With your finger, make a small indent in the center of each patty.
Season both sides of each patty with salt and black pepper generously.
Grease the Air Fryer Basket with cooking spray and then slide inside.
Adjust the temperature of the Air Fryer to 375 °F to preheat for 5 minutes.
After preheating, arrange the patties into the greased Air Fryer Basket in a single layer.
Slide the basket into Air Fryer and set the time for 8 minutes.
After 7 minutes of cooking, place 1 bacon slice over each patty, followed by 1 cheese slice.
After cooking time is finished, remove the patties from Air Fryer and place onto a plate.
Place 1 patty on the bottom of each bun.
Top each patty with lettuce, followed by tomato, onion, ketchup, barbecue sauce, mayonnaise and mustard.
Cover each with top buns and serve.