Make the marinade by mixing the yogurt, olive oil, lemon juice, ketchup, garlic, salt, pepper, chili flakes, paprika, and cumin.
Cut the chicken thighs in half and add them to the marinade, making sure each piece is coated. Marinate for 2-8 hours.
Thread the marinated chicken onto two metal skewers, arranging the pieces side-by-side.
Grill the chicken kebabs, letting them develop a good crust before flipping, until cooked through.
Serve the grilled chicken kebabs on a platter with accompaniments like lavash, hummus, cucumber, tomato, onion, and parsley.
