Preheat oven to 375°F; cut tops off peppers, remove seeds and membranes, and place in a baking dish.
Brown beef in a large skillet over medium; add onion and garlic and cook about 5 minutes until onion is soft.
Drain excess fat; stir in rice, tomatoes, Italian seasoning, salt, and pepper.
Off heat, stir in half the cheese.
Gently pack filling into peppers; pour tomato sauce over tops.
Cover with foil; bake 35 minutes.
Uncover; top peppers with remaining cheese and bake another 10 minutes until melted and bubbly.
Cool 5 minutes before serving.