Grease a large, rimmed metal baking sheet or large broil safe baking dish. Preheat oven to broil on high.
Add all ingredients except for marinara sauce to a large bowl and use your hands or a large fork to mix to combine, being careful not to overmix.
Lightly wet your hands to keep them from sticking and gently shape and roll meat mixture into 12 large meatballs – about 2 inches in diameter.