Marinate Chicken: Combine chicken, olive oil, garlic powder, oregano, paprika, lemon juice, salt, and pepper. Marinate for 15–30 minutes.
Cook Chicken: Heat skillet over medium-high heat. Cook chicken 3–4 minutes per side until golden and done.
Warm Flatbreads: Heat flatbreads briefly in a dry skillet or microwave until soft.
Assemble Flatbreads: Spread tzatziki, layer chicken, cucumbers, tomatoes, red onion, and feta. Sprinkle dill or parsley.
Serve: Slice and serve immediately with extra tzatziki or lemon wedges.
