In a medium bowl, whisk together olive oil, lemon juice, minced garlic, oregano, cumin, paprika, cinnamon, salt, and pepper. Let it sit for a few minutes.

Cut the chicken breast into strips and place them in the bowl of marinade. Toss to coat thoroughly and refrigerate for at least 1 hour or overnight.

Preheat a skillet or grill pan over medium-high heat and cook the marinated chicken strips for 5-7 minutes on each side, until golden brown and cooked through.

Warm the pita bread in a separate pan over low heat for about 5 minutes until soft.

Spread tzatziki sauce onto the warm pita, layer with cooked chicken, sliced red onion, cucumber, and tomato.

Roll up the pita and serve immediately, optionally garnishing with chopped parsley.