Start by placing the chicken pieces in a freezer bag or a bowl. This will allow for easy marination.
In a medium-sized bowl, add the Greek yogurt and olive oil. Stir them together until well combined.
Zest one of the lemons and add the zest to the bowl. This adds a delightful citrus aroma.
Juice that same lemon into the bowl with the zest. Make sure there are no seeds!
Slice the other three lemons and set them aside. They’ll be grilled alongside the chicken.
Add the minced garlic, oregano, kosher salt, and black pepper to the bowl as well. Stir everything until it’s thoroughly mixed.
Pour half of the marinade over the chicken in the freezer bag or bowl, reserving the other half for basting later.
Seal the bag or cover the bowl, then marinate the chicken for 30 minutes to up to 3 hours in the refrigerator. The longer it marinates, the more flavor it absorbs.
When you’re ready to cook, prepare your grill by lightly oiling the grate with vegetable oil or cooking spray. Set the grill to medium-high heat.
Grill the marinated chicken, basting with the reserved marinade. Turn it often to achieve an even browning and those beautiful grill marks. Cook until the chicken is fully cooked, approximately 15 to 20 minutes, or until the juices run clear.
During the last 5 minutes of cooking, add the sliced lemons to the grill, turning them a few times.
Once cooked, allow the chicken to rest for 5 minutes before slicing. Serve with the grilled lemons for a burst of flavor. Refrigerate leftovers for up to 3 days.