sentence: melt butter in a pan add 1 tbsp of all purpose flour whisk it and cook sentence: add milk white pepper salt nutmeg mix and cook sentence: add grated cheddar cheese turn off the heat and stir sentence: place toasted breads on a baking tray and put mustard and ham on top sentence: put some grated swiss cheese on top and cover the top with another mustard applied toast sentence: pour some cheese sauce  bechamel  grated cheese and herbs de provence sentence: bake it in ovens