Devonshire Sandwiches

• 1 parmesan cheese
• 1 make a sauce of butter (white)
• 475 ml chicken broth
• 160 ml cream
• 45 gr butter
• 40 gr flour
• 30 ml wine (white)
• 4 slices bread (toasted)
• 4 slices ham (thin)
• 4 slices chicken