Preheat the oven to 375°F (190°C).
Slice the tops off the bell peppers and remove the seeds.
In a skillet, heat some oil over medium heat and sauté the chopped onion until translucent.
Add minced garlic and ground meat, cooking until browned.
Stir in cooked rice, diced tomatoes, paprika, Italian seasoning, salt, and pepper.
Fill each pepper with the meat and rice mixture.
Place the stuffed peppers upright in a baking dish.
Sprinkle shredded cheese on top (if using).
Pour a little water into the bottom of the dish to keep the peppers moist.
Cover with foil and bake for 25 minutes, then uncover and bake for an additional 10 minutes.