I whisk together olive oil, minced garlic, oregano, lemon juice, salt, and pepper. Then I toss the chicken in this mixture, making sure every piece is coated in those Mediterranean flavors.
I cover the bowl and chill for 20–30 minutes for quick flavor, though I prefer letting it sit up to 2 hours for deeper seasoning.
I grate the cucumber and squeeze out excess water to keep the sauce thick. Then I mix it with Greek yogurt, crumbled feta, lemon juice, minced garlic, and a pinch of salt and pepper.
I preheat my skillet or grill to medium-high and lightly oil it. This helps the chicken sear perfectly without sticking.
I shake off the excess marinade and cook each side 4–5 minutes until golden brown and 165°F (74°C) internally. Then I let it rest 3 minutes before slicing.
I heat the pitas 20–30 seconds per side on the grill or a dry pan until soft and flexible.
I spoon creamy feta tzatziki into the warm pita, add sliced chicken, and finish with extra cucumber or herbs for freshness. Fold and enjoy immediately.