In a bowl, combine olive oil, minced garlic, oregano, paprika, cumin, lemon juice, salt, and pepper. Add the chicken thighs, ensuring they are fully coated. Marinate for at least 30 minutes (or up to overnight) in the refrigerator.
In a mixing bowl, combine the Greek yogurt, grated cucumber (ensure it’s well-drained), minced garlic, olive oil, dill, lemon juice, and salt. Mix until smooth and refrigerate for at least 20 minutes to let the flavors meld.
Heat a grill or skillet over medium-high heat. Remove the chicken from the marinade and cook for about 6-7 minutes per side, or until fully cooked and juices run clear. Once cooked, let it rest for a few minutes before slicing into strips.
Warm the pita breads on the grill for a minute. Place a generous amount of shredded lettuce, diced tomato, sliced cucumber, and sliced chicken strips onto each pita.
Drizzle a good amount of the tzatziki sauce over the top of the fillings.
Fold the pita over the fillings and wrap in parchment paper for an easy grab-and-go option, or serve immediately on a plate.
Notes
Marinating the chicken overnight enhances the flavor.