Combine soup, milk, mustard and atrragon. Stir in chicken, broccoli and green onion. Spoon about 1/2 c mixture into center of each tortilla. Fold in sides and roll up. Place seam side down in a greased 12x8 or 9x13 dish.
Bake at 350 for 15 minutes, sprinkle with cheese and bake 10 minutes longer.