Add all ingredients to a mixing bowl. Gently incorporate everything into the beef with a wooden spoon or your hands. Be careful not to overwork the meat.
Use a medium cookie scoop, or large spoon, to make 20 meatballs. Roll them between your hands after scooping to ensure they're round.
Bake for 25 minutes on an unlined baking sheet.
Serve immediately or store in an airtight container up to 4 days in the refrigerator.