Add flour and butter over ... gradually and cubed cheese gradually until thickened. Heat until smooth and creamy. Add ham until warmed. Combine cooked shells ... 350 degrees until bubbly.
Cook macaroni according to package ... drain again. Cut ham slice into small cubes. Mix in large bowl: macaroni, Cheddar cheese, milk, 1/2 stick butter. Use rest of butter ... hour to 45 minutes.