In a large bowl, combine ground chicken, breadcrumbs, Parmesan cheese, parsley, egg, garlic, oregano, salt, and pepper. Mix until well combined.
Preheat the oven to 400°F. Line a baking sheet with parchment paper.
Form the chicken mixture into meatballs, about 1 inch in diameter, and place them on the prepared baking sheet.
Drizzle olive oil over the meatballs and bake for 20-25 minutes, or until cooked through and golden brown.
While the meatballs are baking, bring chicken broth to a boil in a medium saucepan. Add orzo and cook according to package instructions, usually about 8-10 minutes.
Once the orzo is cooked, drain any excess liquid and stir in lemon zest and lemon juice. Season with salt and pepper to taste.
Serve the meatballs over the lemon orzo, topped with crumbled feta cheese and extra parsley for garnish.