Preheat your oven to 375°F (190°C).
Cut off the tops of the bell peppers and remove the seeds and membranes.
Blanch the peppers in boiling water for 2-3 minutes to soften them slightly, then rinse with cold water.
In a large bowl, combine the ground beef, cooked rice, garlic, oregano, basil, salt, and pepper. Mix well.
Stuff each bell pepper with the prepared filling, pressing down gently to pack it in.
Place the stuffed peppers in a baking dish and pour the tomato sauce over them.
Cover the dish with aluminum foil and bake for 1 hour.
After 1 hour, remove the foil and sprinkle the Parmigiano-Reggiano cheese over the top of each pepper. Bake for an additional 20 minutes or until the cheese is melted and golden.
Let the peppers rest for 10 minutes before serving to allow the filling to set.