For the Chicken Marinade:
In a large bowl, combine olive oil, Greek yogurt, lemon juice, onion powder, garlic powder, shawarma spices, coriander powder, Aleppo pepper, black pepper, salt, and paprika. Mix well to form a smooth marinade.
Add the chicken strips to the marinade, ensuring each piece is well coated. Cover and refrigerate for at least 2 hours, preferably overnight for maximum flavor.
For the Tzatziki Sauce:
In a medium bowl, combine Greek yogurt, garlic sauce (or paste), water, lemon juice, and salt. Mix well until smooth.
Cover and refrigerate for at least 30 minutes to allow flavors to meld together.
Cooking the Chicken:
Heat a large skillet over medium-high heat. Remove the chicken from the marinade, allowing excess to drip off.
Cook the chicken in the skillet for 6-7 minutes on each side, or until fully cooked through and slightly charred on the edges. The internal temperature should reach 165°F (74°C).
Remove from heat and let rest for 5 minutes before chopping into smaller pieces if desired.
Assembling the Quesadillas:
Lay a tortilla flat on a clean surface. Spread about 1.5 tablespoons of tzatziki sauce evenly over half of the tortilla.
Add approximately one-fifth of the cooked chicken on top of the sauce.
Sprinkle about 1/4 cup of shredded mozzarella cheese over the chicken.
Add any optional toppings like chopped tomatoes, pickled cucumbers, or turnips if desired.
Fold the tortilla in half to cover the filling, creating a half-moon shape.
Cooking the Quesadillas:
Heat a large non-stick skillet or griddle over medium heat.
Place the assembled quesadilla in the skillet and cook for 2-3 minutes on each side, or until the tortilla is golden brown and crispy and the cheese has melted.
Remove from heat and repeat with the remaining ingredients to make all 5 quesadillas.
Serving:
Cut each quesadilla into triangles and serve hot with extra tzatziki sauce on the side.
Garnish with fresh parsley if desired.