Preheat the oven to 400°F (200°C) and line a large baking sheet with parchment paper.
In a large mixing bowl, combine the ground chicken, panko, egg, feta cheese, minced garlic, oregano, parsley, lemon zest, salt, and pepper. Mix until just combined.
Form the mixture into approximately 16-20 meatballs and arrange them on the prepared baking sheet.
Bake the meatballs for 15 to 18 minutes, or until the internal temperature reaches 165°F (74°C).
While the meatballs bake, heat olive oil in a large skillet over medium heat. Add the dry orzo and toast for 2 minutes, stirring frequently until fragrant.
Slowly pour in the chicken broth and bring to a simmer. Reduce heat to low-medium, cover, and cook for 8 to 10 minutes or until the liquid is absorbed and orzo is al dente.
Stir the baby spinach into the hot orzo until wilted, then fold in the fresh lemon juice and dill.
Serve the warm meatballs over the lemon orzo. Garnish with additional fresh herbs or lemon wedges if desired.