Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
In a large bowl, combine the ground chicken, breadcrumbs, Parmesan cheese, parsley, red onion, garlic, oregano, cumin, salt, pepper, beaten egg, and lemon zest.
Mix the ingredients with your hands or a spoon until well combined; be careful not to overmix.
Form the mixture into meatballs, about 1.5 inches in diameter, and place them on the prepared baking sheet.
Drizzle the meatballs with olive oil for added moisture and flavor.
Bake for 20-25 minutes or until the meatballs are cooked through and golden brown on the outside (the internal temperature should reach 165°F).
Remove from the oven and let them rest for a few minutes before serving.
Notes
Serve warm with tzatziki sauce and a Greek salad for a complete meal.