Lightly brown the sausage meat, then brown the ground meat separately. Place both types of meat in a mixing bowl.
Peel and chop the onion.
Add half of the chopped onion to the mixing bowl with the meat. Add the garlic, salt, pepper, and the Air Fryer seasoning mix. Mix everything together until well combined.
Cut off the tops of the tomatoes and scoop out the insides. Season the insides with salt and pepper. Fill the tomatoes with the stuffing and place the tops back on top of the stuffing.