In a large bowl, combine the ground chicken, breadcrumbs, feta cheese, parsley, minced garlic, oregano, salt, pepper, and the beaten egg.
Mix the ingredients together until just combined; be careful not to overmix.
Form the mixture into small meatballs, about 1 inch in diameter.
Heat olive oil in a skillet over medium heat. Add the meatballs in batches, cooking until they are golden brown on all sides and cooked through, about 8-10 minutes. Remove from skillet and set aside.
In a saucepan, bring the chicken broth to a boil. Add the orzo pasta and cook according to package instructions until tender, about 8-10 minutes.
Once the orzo is cooked, drain any excess liquid, then stir in the lemon zest, lemon juice, and season with salt and pepper to taste.
Place the cooked orzo onto serving plates, top with the Greek chicken meatballs, and garnish with fresh mint leaves.