1. Preheat oven to 375°F. Cook the macaroni according to the pkg. instructions, or until al dente. Drain, rinse, and set aside.
2. In a large saucepan, sauté the onion in butter for 2 min., until transparent. Blend in the flour, stirring well to incorporate, and cook for an additional minute. Whisk the milk into the butter-and-flour mixture. Bring to a simmer and cook until the sauce thickens. Reduce to low heat and add the pepper and mustard. Stir in 2 1/2 c. of the cheese until blended into the sauce. Add the cooked macaroni and prosciutto to the cheese sauce, and mix well.
3. Place the macaroni mixture in a buttered, oven proof, 9 x 9 in. dish. Top with the remaining 1/2 c. of cheese. Bake for 30 min. or until the top is golden brown. Sprinkle the surface with parsley for service.
* Omit the prosciutto for a delicious vegetarian offering.
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