In a large mixing bowl, combine the chicken cubes, onion wedges, and thin lemon slices. Add the olive oil, lemon juice, minced garlic, dried oregano, smoked paprika (if using), sea salt, and black pepper. Toss everything together thoroughly for about 2 minutes, ensuring each chicken piece is well-coated with the marinade. Cover the bowl with plastic wrap and let it sit for at least 30 minutes to allow the flavors to meld.

After marinating, carefully take skewers and thread the marinated chicken, onion, and lemon slices onto them, alternating for a colorful presentation. Be sure to leave a bit of space between each piece to allow for even cooking on the grill. This process should take about 5-7 minutes.

Preheat your grill to medium heat, aiming for around 350°F (175°C). It’s important to ensure the grilling surface is hot before adding your skewers—this helps achieve those beautiful grill marks and locks in moisture. Allow the grill to heat for about 10-15 minutes, keeping the lid closed.

Once the grill is hot, carefully place the skewers on the grill. Let them cook for approximately 10-15 minutes, turning occasionally to ensure even grilling and avoid burning. Keep an eye on the chicken, aiming for a golden-brown color. Use a meat thermometer to check that the chicken reaches an internal temperature of 165°F (75°C).

Once cooked to perfection, remove the skewers from the grill and transfer them to a serving platter. For a delightful finishing touch, sprinkle freshly chopped parsley over the kabobs and add lemon wedges on the side for extra zesty flavor. Your Grilled Greek Lemon Chicken Kabobs are now ready to enjoy!