Preheat the oven to 400°F and line two rimmed baking sheets with parchment paper.
2
In a large bowl, combine ground beef, grated onion, minced garlic, ground pepper, salt, cumin, dried oregano, cinnamon, minced parsley, eggs, and panko bread crumbs. Mix thoroughly using your hands or a stand mixer.
3
Form the mixture into 30 golf ball-sized meatballs and place them evenly spaced on the prepared baking sheets.
4
Bake the meatballs for 20-25 minutes, rotating the pans halfway through, until cooked through.
TZATZIKI
5
In a small bowl, combine Greek yogurt, grated cucumber, dried dill, za'atar, minced garlic, lemon juice, sea salt, and black pepper. Mix well.
6
Cover and refrigerate the tzatziki sauce for 1 hour for the flavors to meld.
SERVING
7
Serve meatballs alongside the homemade tzatziki sauce. Enjoy!