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

Cut chicken breast into bite-sized chunks and add to the marinade, tossing well to coat. Marinate in the refrigerator for at least 15-45 minutes.

In a large bowl, combine diced cucumbers, tomatoes, bell pepper, red onion, chopped parsley, lemon juice, salt, and pepper.

Heat a large skillet or grill pan over medium-high heat. Add marinated chicken to the skillet and cook for 3-5 minutes on each side until fully cooked.

Warm the pitas on a skillet or directly over a flame until soft and pliable.

Assemble tacos by placing chicken inside each pita, adding fresh salsa, and drizzling with tzatziki sauce.