In a large bowl, whisk together olive oil, minced garlic, lemon juice, oregano, cumin, paprika, salt, and pepper.

Add chicken breasts to the marinade, ensuring they are fully coated. Refrigerate for 1 hour to overnight.

In a separate bowl, combine Greek yogurt, feta cheese, grated cucumber, minced garlic, dill, mint, lemon juice, salt, and pepper. Mix and refrigerate.

Preheat your grill to medium-high heat.

Grill the chicken for 6-7 minutes per side until fully cooked.

Let the grilled chicken rest for 5 minutes before slicing.

Warm pita bread on the grill for about 1 minute per side.

Assemble by placing sliced chicken, tzatziki, and fresh vegetables in pita.