Preheat oven to 400°F (200°C) and line a rimmed baking sheet with parchment paper.
In a large mixing bowl, combine the ground chicken, breadcrumbs, feta, egg, garlic, parsley, dill, oregano, lemon zest, salt, and pepper.
Mix the ingredients by hand until just incorporated, ensuring the feta is evenly distributed without overworking the meat.
Form the mixture into approximately 16 meatballs, roughly 1.5 inches in diameter.
Place the meatballs on the prepared baking sheet and lightly brush or spray with olive oil.
Bake for 18 to 20 minutes or until the internal temperature reaches 165°F (74°C) and the exteriors are lightly browned.
Remove from the oven and allow to rest for 5 minutes before serving with tzatziki or over a salad.