How to Make It
Combine chopped pepper tops with ground turkey, cooked brown rice, breadcrumbs, 1/4 cup marinara sauce, onion, Parmesan cheese, parsley, tomato paste, salt, black pepper, egg, and garlic. Mix thoroughly.
Stuff about 1 cup ground turkey mixture into each pepper. Pour 1/2 cup water into bottom of Instant Pot. Place a rack in the pot; stand stuffed peppers upright on the rack. Cover each pepper top with 2 tablespoons marinara sauce. Cover and cook on high pressure 15 minutes; natural release. Open the lid, top with mozzarella cheese, and cover until cheese melts, about 2 minutes.