sentence: brush the slices of bread with melted butter on both sides before toasting in the oven sentence: add flour and then milk to a saucepan with melted butter and stir until the flour dissolves sentence: add cheese salt pepper and a touch of nutmeg to the sauce and stir sentence: spread dijon mustard on half of the bread sentence: add a layer of swiss cheese ham and another slice of cheese and then top with a bread slice sentence: pour sauce onto the sandwich and top with a slice of cheese sentence: cook in the broiler for a few minutes