Preheat oven to 350°F (180°C). Cut off the tops of the bell peppers and remove the seeds.
Heat the olive oil in a skillet over medium heat. Sauté the finely chopped onion and minced garlic until softened.
Add the ground beef, season with salt and pepper, and cook until browned and fully cooked through.
In a bowl, combine the cooked ground beef with the cooked rice, chopped parsley, and grated Parmesan cheese.
Stuff the bell peppers with the meat mixture and place them in a baking dish.
Pour the tomato sauce around the stuffed peppers in the baking dish, then cover with aluminum foil.
Bake the stuffed peppers for 35-40 minutes. Remove the foil for the last 10 minutes to allow the tops to brown slightly.
Serve the stuffed peppers hot, garnished with fresh parsley.
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