Cook macaroni in boiling salted water until almost tender. Meanwhile, in a small saucepan, melt butter. Stir in flour, salt, mustard, pepper and hot pepper sauce.

Cook and stir until smooth. Drain macaroni; combine with butter mixture in a large bowl and mix well. Stir in milk and 4 cups of cheese. Pour into an ungreased 13x9x2" baking dish. Cover and bake at 350F for 45 minutes or until bubbly. Sprinkle with remaining cheese; let stand 5 minutes before serving.

Per serving: 88 Calories (kcal); 6g Total Fat; (63% calories from fat); 3g Protein; 5g Carbohydrate; 20mg Cholesterol; 253mg Sodium Food Exchanges: 0 Grain(Starch); 0 Lean Meat; 0 Vegetable; 0 Fruit; 1 Fat; 0 Other Carbohydrates