How to make it
6 steps. Take it one step at a time.
Preheat your oven
Preheat your oven to 400°F (204°C). Line a baking sheet with parchment paper.
Melt the butter in a small saucepan
Melt the butter in a small saucepan over medium heat. Whisk in the flour and cook for 1-2 minutes until slightly golden. Gradually whisk in the milk until the sauce thickens. Season with salt, pepper, and nutmeg. Set aside.
5 minLightly toast the bread slices
Lightly toast the bread slices. Spread a thin layer of Dijon mustard on two of the slices, followed by a spoonful of the Béchamel sauce.
Layer two slices of ham
Layer two slices of ham on each prepared bread slice and top with about 1/3 of the shredded Gruyère cheese. Place the remaining bread slices on top.
Spread the remaining Béchamel sauce
Spread the remaining Béchamel sauce over the tops of the sandwiches and sprinkle with the rest of the Gruyère cheese.
Bake in the preheated oven
Bake in the preheated oven for 10-15 minutes, or until the cheese is melted and bubbly. You can broil for the last 2 minutes for a darker crust.
10 min
A little kitchen wisdom
For the best flavor, use a high-quality ham and authentic Gruyère or Comté cheese. Sourdough or brioche bread provides excellent structure and flavor.



