Preheat your oven to 375°F (190°C).
Cut the tops off the bell peppers and remove the seeds.
In a skillet, sauté chopped onions and garlic until translucent.
Add ground meat and cook until browned.
Stir in diced tomatoes, cooked rice, paprika, cumin, salt, and pepper.
Fill each bell pepper with the meat mixture.
Place stuffed peppers upright in a baking dish.
Top with shredded cheese if desired.
Cover with foil and bake for 25 minutes.
Remove foil and bake for an additional 5-10 minutes until cheese is bubbly.