In a large bowl, mash the spam with a fork until finely ground (or pulse it in a food processor). Add the rest of the meatball ingredients and mix thoroughly. DO NOT ADD SALT! Firmly pack the mix into 18 meatballs. Heat the oil in a nonstick saute pan and add the meatballs. Cook over low heat until golden brown. They fall apart easily until fully cooked, so be gentle with them when turning. Also, don’t use too much oil or they will disintegrate into it. Remove to a paper towel when golden on the outside.
Place the meatballs in an ovenproof dish. Spoon some marinara over each meatball. Sprinkle with shredded mozzarella cheese. Bake at 375 degrees for about 15 minutes, or until the cheese is melted and starting to brown. Serve hot.
Approximate nutrition information per “naked” meatball: 85 calories, 7g fat, .9g net carbs, 4g protein Per meatball & toppings: 110 calories, 8g fat, 2g net carbs, 6g protein Per serving (3) meatballs & toppings: 329 calories, 24g fat, 6g net carbs, 18g protein