How to Make It
Preheat grill to medium-high heat (350° to 400°).
Combine first 14 ingredients in a large mixing bowl, stirring until well blended. Divide mixture into 16 portions; shape each portion into a cylinder. Brush each meatball evenly with olive oil.
Grill meatballs, turning once, 6 to 10 minutes or until cooked through. Serve with Avocado-Mint Tzatziki and flatbread.