1. In a deep, 2 1/2-quart, heat-resistant, non-metallic casserole melt butter or margarine in Microwave Oven 30 seconds. 2. Blend in flour, salt, pepper and dry mustard stirring until smooth. 3. Gradually stir in milk until smooth. 4. Heat, uncovered, in Microwave Oven 10 minutes or until thick- ened and smooth. Stir frequently during last half of cooking time. 5. Add shredded cheese and stir until melted. 6. Add cooked macaroni and luncheon meat. Stir until well blended. 7. In a small, heat-resistant, non-metallic bowl combine melted butter or margarine and bread crumbs and heat, uncovered, in Microwave Oven 3 minutes or until bread crumbs are lightly browned. 8. Sprinkle bread crumb mixture over macaroni mixture. 9. Heat, uncovered, in Microwave Oven 5 minutes or until heated through.

luncheon meat may be substituted for the canned luncheon-meat.