Rinse chicken; pat dry. lbs breasts flat. Place one prosciutto slice atop each breast half.
Combine apple and 1/8 tsp apple pie spice. Place a fourth of the apple mixture on each breast half. Roll up and secure with wooden picks. Sprinkle with additional pie spice. Place in an 11 x 7-inch baking dish. Bake, uncovered, in a 350° F oven for 25 to 30 minutes or till tender and no longer pink. Remove picks.
In a small saucepan, cook onion in margarine till tender. Stir in flour and a dash pepper. Add milk. Cook and stir till thickened and bubbly; cook and stir 1 minute more. Stir in cheese till melted.
Serve sauce over chicken rolls. Serve with rice.Servings: 4