In a baking dish or pie plate, combine the rest of the ingredients (except tzatziki). Whisk together.
Put the chicken in the yogurt mixture and toss to coat. Cover with plastic wrap and refrigerate at least 30 minutes or overnight.
Thread the chicken onto skewers. You can do this in a zig-zag patter to get through the length of the chicken if it is difficult to get the skewer to stay through the middle.
Heat a grill to medium heat. When hot, place the chicken skewers on the grill and cook 3-4 minutes.
Flip and continue cooking until the chicken is cooked all the way through to 170F, approximately 3-5 minutes more.
Remove chicken from the grill and drizzle with olive oil. Serve with tzatziki sauce if desired or additional lemon wedges.
The exact time to cook the chicken will vary based on your grill heat and the thickness of the chicken. The best way to ensure your chicken is cooked properly is to use a thermometer to read the internal temperature of the chicken. It should be 170F.This chicken would go great with salad, couscous, rice, and grilled vegetables. It would also be fantastic in a sandwich or gyro.Get our recipe for Greek Tzatziki Yogurt Sauce!