In a large mixing bowl, combine the ground chicken, salt, pepper, cumin, oregano, red pepper flakes, dill, mint, red onion, garlic, and lemon zest.
Mix gently with clean hands until everything is evenly combined. Avoid overmixing to keep the meatballs tender.
Scoop the mixture using a tablespoon or cookie scoop and roll into evenly sized meatballs.
Heat the olive oil in a large skillet over medium heat.
Place the meatballs in the skillet without overcrowding the pan. Cook in batches if necessary.
Cook for 3–4 minutes per side until nicely browned and the internal temperature reaches 165°F (74°C).
Transfer the cooked meatballs to a serving platter.
Assemble bowls with chopped romaine, cooked rice, cucumber, tomatoes, feta cheese, and warm Greek Chicken Meatballs.
Drizzle generously with tzatziki sauce and serve immediately.