Begin by preparing the marinade. In a ziplock bag, combine olive oil, lemon juice, minced garlic, salt, and pepper.

Add the chicken thighs to the bag, seal it, and massage the chicken to ensure it is well-coated. Allow it to marinate for at least 2 hours, or overnight for enhanced flavor.

While the chicken is marinating, prepare the tzatziki. Cut the cucumbers lengthwise and remove the watery seeds. Grate them and wrap in a towel to remove excess moisture.

In a separate bowl, combine the grated cucumber with yogurt, minced garlic, lemon juice, olive oil, and salt. Let the mixture rest for about 20 minutes to allow the flavors to meld.

Chop your salad ingredients by mixing diced tomatoes, cucumbers, red onion, and parsley, if desired, in a bowl.

To cook the chicken, preheat your grill to medium-high and brush it with oil. Alternatively, heat oil in a frying pan. Cook the chicken for approximately 2 to 3 minutes on each side until they are golden and fully cooked.

After cooking, allow the chicken to rest for about 5 minutes.

To assemble your gyros, warm the pita bread and place some salad in the center. Top it with sliced chicken and tzatziki sauce. Wrap it up and enjoy!

For a delightful side, consider pairing these gyros with sweet potato fries or a light Greek salad.