It is not necessary to serve your air-fried frozen meatballs plain if you want to improve the flavor. Serve them in meatball subs or over pasta with marinara or alfredo sauce to make a delicious meal. Alternative serving suggestions include serving the meatballs as an appetizer with a dip or sauce. Gravy, keto cheese sauce, barbecue sauce, sweet and sour sauce, jelly-based sauce, and peanut sauce are just a few of the mouthwatering possibilities.