Cut the tops of the peppers off and then scrape out the seeds.
Brush the peppers with olive oil, inside and out. Place them into the air fryer basket and cook them for 5 minutes.
While the peppers are cooking, season the beef with salt and pepper then brown it with the onions and garlic, in a medium saucepan, over medium high heat. Cook it until there is no more pink in the beef and then drain the grease.
Add the cooked rice, tomato sauce, and Italian seasoning to the beef mixture and simmer it for 4 minutes.
Scoop the beef mixture into the peppers and place them back into the air fryer. Cook at 350 degrees F for 8 minutes. Top them with the shredded mozzarella and place back into the air fryer for another 3-4 minutes, until the tops are golden brown.
Notes
If the peppers wobble, trim a tiny bit off the bottom so they sit flat in the air fryer basket.
If the cheese browns too fast, loosely tent the peppers with foil for the last few minutes.
For extra color, mix different bell pepper colors in the same batch.
Store leftovers in an airtight container in the fridge for up to 4 days.
Reheat leftovers in a preheated air fryer at 300 degrees F for about 5 minutes, until the filling is heated all the way through.
This nutrition information is based on the exact products I used in this recipe. Brands and sizes of products could alter exact nutrition and should always be calculated independently.