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Adjust rack to top position and preheat oven to 425 degrees. Wash and dry all produce.
Halve, peel, and thinly slice onion; mince a few slices until you have 2 TBSP (4 TBSP for 4 servings). Peel and mince garlic.
In a large bowl, combine beef*, panko, Shawarma Spice, paprika, minced onion, half the garlic, and ¾ tsp salt (1½ tsp for 4). Form into 10-12 (20-24 for 4) 1½-inch meatballs.