8 oz Mushroooms, sliced 1 1/2 c Dressing, Miracle Whip 2 tb Dressing, Miracle Whip 2 c Chicken or turkey, cooked, 1 Chopped 10 oz Vegetables, mixed, frozen, 1 Thawed and drained 1/4 c Onion, chopped 1/4 c Flour 1 1/4 c Milk 1 t Basil, leaves, dried 1/2 t Salt 1/2 t Pepper 1 1/2 c Cheese, cheddar, shredded 2 c Potatoes, mashed, hot Cook mushrooms and onions in 2 tb dressing over med-high heat. Add flour and seasonings; gradually add milk, stirring until thickened. Stir in 1 cup dressing, turkey, vegetables and 1 cup cheese; cook 5 minutes. spoon mixture into 1 1/2 quart cassrole. Stir 1/2 cup dressing into potatoes. Top casserole with potato mixture; broil until golden. Sprinkle with remaining cheese; broil until cheese begins to melt.