Add the onion, garlic, egg, bread crumbs, ketchup, parsley, Parmesan, Pecorino, salt and pepper to a large bowl and blend. Mix in the turkey. Shape the turkey mixture into 1 1/4-inch-diameter meatballs. Place on a large plate or baking sheet.
Heat the oil in a heavy large frying pan over medium-high heat. Add the meatballs and saute until browned on all sides, about 5 minutes. Turn off heat. Transfer the meatballs to a plate. Pour off any excess oil. Add the marinara sauce, about 3 cups. Return all the meatballs to the pan. Turn the heat to medium-low and simmer until the sauce thickens slightly and the flavors blend, 15 to 20 minutes. Season the sauce, to taste, with salt and pepper.
Transfer the meatball mixture to a serving bowl. Serve with toothpicks
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