Preheat the air fryer to 350°F.
Brown the ground beef in a skillet over medium heat, breaking it up as it cooks. Drain any excess fat and set aside.
In a large mixing bowl, combine the browned ground beef, cooked rice, garlic powder, salt, pepper, tomato paste, and Rotel. Stir until thoroughly combined. Taste and adjust seasoning if needed.
Cut the tops off each bell pepper and remove the seeds and membranes from the inside. Rinse and pat dry.
Scoop the filling evenly into each pepper, pressing down gently to pack it in. Mound it slightly over the top. It’s okay if it goes a little above the rim.
Place the stuffed peppers upright in the air fryer basket. Air fry at 350°F for 10 minutes.
Remove the basket and sprinkle each pepper generously with shredded cheddar cheese. Return to the air fryer for 3–5 minutes, until the cheese is fully melted and bubbly.
Remove carefully. The peppers will be hot! Serve immediately. Enjoy!