Preheat oven to 425° F. Place a metal rack in a shallow baking pan and coat with cooking spray.
Cut turkey into 16 evenly-sized nuggets; set aside in a bowl.
Place egg in a small bowl and beat lightly. In another small bowl stir together the cornmeal, Parmesan cheese, and Italian seasoning.
Pour egg over turkey pieces, stirring to coat, then place pieces into a plastic zip-top bag. Pour cornmeal mixture into bag, close top, and shake to coat evenly.
Place nuggets on prepared rack. Lightly coat each nugget with cooking spray. Bake for 20 minutes or until turkey is golden and crispy (165° F).
Meanwhile, in a small bowl whisk together Greek yogurt, honey, mustard, barbecue sauce, and salt. Serve nuggets with dipping sauce. Store any leftover nuggets in a freezer-safe bag and reheat in the oven.