Preheat oven to 350. Spray pan with nonstick cooking spray. In a skillet, saute onion for 5 minutes or until browned. Place in large bowl; cool. Add meats, bread crumbs, 2/3 cup bbq sauce, egg whites and seasonings to bowl; mix very well. On pan, shape mixture into a rounded loaf. Top with remaining bbq sauce.
Prepare vegetables: In large bowl, toss ingredients; place around meatloaf. Bake 45 minutes; carefully stir vegetables to coat with meatloaf juices. Increase heat to 400. Bake 15 minutes. Let meatloaf stand 10 minutes before slicing.
I substituted potatoes (white and sweet) for the parsnips. I did not add the chiles. I substituted beef, veal and pork for the turkey and pork. I cut the recipe in half.