Creating delicious Greek Chicken Gyros is simple if you follow these steps:

1. Prepare the Marinade: In a bowl, mix together olive oil, minced garlic, oregano, paprika, salt, pepper, and lemon juice.
2. Marinate the Chicken: Add the chicken thighs to the marinade, ensuring they are well coated. Cover and refrigerate for at least 30 minutes or up to overnight for maximum flavor.
3. Preheat the Grill: Heat your grill or skillet over medium-high heat.
4. Cook the Chicken: Remove the chicken from the marinade and grill for about 5-7 minutes per side, or until fully cooked (internal temperature should reach 165°F).
5. Rest the Chicken: Remove the chicken from the grill and let it rest for about 5 minutes. This helps keep it juicy.
6. Prepare the Tzatziki Sauce: While the chicken is resting, mix together Greek yogurt, grated cucumber, minced garlic, olive oil, dill, salt, and pepper in a bowl. Adjust seasoning to taste.
7. Slice the Chicken: After resting, slice the chicken into thin strips.
8. Prepare the Pita: Warm the pita bread on the grill for a minute or until soft and pliable.
9. Assemble the Gyros: Place sliced chicken onto the warm pita, top with tzatziki sauce, sliced tomatoes, shredded lettuce, and red onion. Add feta cheese if desired.
10. Garnish and Serve: Sprinkle with fresh parsley and serve with extra tzatziki on the side.

These steps will guide you to create incredible Greek Chicken Gyros that will impress everyone around your table!