In a skillet heat 2 tablespoons oil; add the onions, peppers, prosciutto and black olives; saute until onion is soft; remove from skillet - set aside. To the same skillet add the remaining oil and flour; cook stirring constantly for about five minutes. Slowly add milk, whisking to make a loose sauce (add additional milk as needed). Cook until the sauce thickens; add the shredded cheese; stir until completely melted. In a large bowl, mix together the pasta, onion/pepper mix and sauce; pour into baking dish. Bake at 350 degrees F for about thirty minutes; serve hot.
Per Serving: 473 Calories (34.2% from fat); 18g Fat (6g Sat, 9g Mono, 2g Poly); 17g Protein; 61g Carbohydrate; 2g Dietary Fiber; 26mg Cholesterol; 284mg Sodium. Food Exchanges: 4 Grain (Starch); 1 Lean Meat; 3 Fat.