Warm the skillet: Heat the olive oil in a large skillet over medium heat until it shimmers.
Sauté aromatics: Add onion and bell pepper. Cook 4–5 minutes, stirring, until softened.
Add garlic and cook 30 seconds until fragrant.
Brown the turkey: Add ground turkey, breaking it up with a spatula. Season with salt, pepper, oregano, cumin, and red pepper flakes if using. Cook 6–8 minutes until no longer pink and lightly browned.
Add the bright bits: Stir in cherry tomatoes and olives.
Cook 2–3 minutes until tomatoes begin to soften.
Wilt the greens: Add spinach (or kale). Toss until just wilted, about 1–2 minutes.
Finish with lemon and feta: Turn off the heat. Stir in lemon zest, lemon juice, and feta.
Taste and adjust salt, pepper, and lemon as needed.
Garnish and serve: Sprinkle with fresh parsley. Serve on its own, over rice or cauliflower rice, or spooned into warm pita with a dollop of yogurt or tzatziki.