Marinate the Chicken: In a large bowl or gallon-sized zip-top bag, combine the Greek yogurt, Dijon mustard, apple cider vinegar, olive oil, honey, minced garlic, Italian seasoning, smoked paprika, chili powder, cumin, Morton kosher salt, and plenty of fresh cracked black pepper. Add the chicken thighs and mix well to fully coat. Cover (or seal the bag), and refrigerate for at least 2 hours, or ideally overnight. Do not marinate for more than 24 hours, as the acidity and yogurt can start to break down the meat too much.
2 1/2 pounds boneless skinless chicken thighs, 1/4 cup plain greek yogurt, 2 Tablespoons dijon mustard, 2 Tablespoons apple cider vinegar, 1 Tablespoons olive oil, 1 Tablespoon honey, 8 cloves garlic,, 2 teaspoons EACH italian seasoning,, 2 teaspoons Morton kosher salt, fresh cracked black pepper