Marinate the Chicken:
In a large bowl, combine olive oil, lemon juice, minced garlic, dried oregano, dried thyme, salt, and pepper. Add the chicken breasts to the bowl, making sure each piece is well-coated with the marinade. Cover the bowl and refrigerate for at least 1 hour (or up to overnight for extra flavor).
Prepare the Tzatziki Sauce:
In another bowl, mix the Greek yogurt, grated cucumber (squeeze out excess water with a paper towel), minced garlic, olive oil, lemon juice, and salt. Stir until all ingredients are well combined. For added freshness, add chopped dill. Cover and refrigerate until ready to serve.
Grill the Chicken:
Preheat your grill or stovetop grill pan over medium-high heat. Grill the marinated chicken breasts for about 5-6 minutes on each side or until the internal temperature reaches 165°F (75°C) and the chicken is nicely charred. Once cooked, remove from heat and let it rest for a few minutes before slicing into thin strips.
Warm the Pita Bread:
Warm each pita bread on the grill or in a pan for about 1 minute on each side until soft and slightly charred.
Assemble the Gyros:
Place sliced grilled chicken on each pita bread. Top with a generous dollop of tzatziki sauce, sliced tomatoes, red onions, and a sprinkle of fresh parsley, if desired.
Serve and Enjoy:
