Wash the bell peppers and cut the tops off the peppers and scoop the seeds and membranes from the peppers. Set aside. Set a sauté pan over medium heat and cook the onions until soft for 3-4 minutes. Mix the crumbled meatballs, onions, cheeses, bread crumbs, salt, eggs, and parsley together in a large bowl. Fill the peppers with the stuffing. Set them on a rack with a pan under the rack to catch any drippings. Bake them for 45 to 55 minutes. Meanwhile, heat marinara sauce over low heat in a sauce pan. Remove from the over and serve immediately with some of the warmed marinara sauce.
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