Creating the Greek Chicken Wrap is straightforward if you follow these clear steps:

1. Marinate the Chicken: In a bowl, mix olive oil, oregano, garlic powder, salt, and pepper. Coat the chicken breasts with this marinade. Let it sit for at least 15 minutes for enhanced flavor.

2. Cook the Chicken: Preheat a grill or skillet over medium-high heat. Cook the marinated chicken breasts for 6-7 minutes on each side or until fully cooked and internal temperature reaches 165°F (75°C). Let it rest before slicing.

3. Prepare the Vegetables: While the chicken is cooking, wash and slice the cucumber, tomato, and onion. Set aside the spinach and crumbled feta.

4. Assemble the Wrap: Lay a wrap or pita flat on a clean surface. Start by placing a handful of fresh spinach in the center.

5. Add the Chicken: Slice the cooked chicken breasts into strips and layer them over the spinach.

6. Top with Veggies: Add the cucumber slices, diced tomatoes, red onion, and sprinkle feta cheese on top.

7. Drizzle Sauce: Add a generous amount of tzatziki sauce over the fillings.

8. Wrap It Up: Carefully fold the sides of the wrap inward and then roll from the bottom up, securing all the delicious fillings inside.

9. Serve Immediately: For an additional option, you can grill the wrapped sandwich for a couple of minutes to achieve a crispy texture.

10. Garnish and Enjoy: Slice the wrap in half, garnish with parsley, and serve with extra tzatziki on the side.