Preheat oven to 350. Prepare a 2-quart casserole dish with cooking spray; set aside. Place hot noodles under cold running water until cool enough to handle. Drain and set aside. In a mixing bowl, combine soup and milk; set aside. In another mixing bowl, combine tuna, mixed vegetables, half cup cheddar cheese, egg whites, bread crumbs, salt, and half cup soup mixture. Cut cooled noodles crosswise into halves. Spoon equal amounts of tuna mixture onto center of each noodles; roll up noodles. Place noodles, seam side down, in prepared dish. Top with remaining soup mixture. Bake, covered for 35 mintues or until heated through. Top with remaining cheese. Bake for five minutes more or until cheese has melted.