Cut the bell peppers in half lengthwise and scoop out the seeds and cores. Place the peppers cut side up in a baking dish and bake for 20 minutes.
While the peppers are baking, prepare the filling. Heat the oil in a large skillet over medium heat. Add the onion and sauté for 5-7 minutes, until fragrant. Add the italian seasoning and sauté for an additional minute.
Add the ground beef to the skillet and cook with the onion, breaking it up into small pieces as it cooks, until completely brown.
Remove the skillet from heat. Sprinkle the salt over the beef and add the cooked rice. Toss until the beef and rice are evenly distributed.