Let's Cook

1. Step 1.

   Adjust oven rack 6 inches from broiler element and heat oven to 375 degrees.

2. Step 2.

   Line rimmed baking sheet with aluminum foil and spray with vegetable oil spray.

3. Step 3.

   Brush bread on both sides with melted butter and place on prepared sheet.

4. Step 4.

   Bake until light golden brown on top, about 10 minutes.

5. Step 5.

   Remove sheet from oven and flip slices. Return to oven and bake until golden brown on second side, about 3 minutes.

6. Step 6.

   Reserve 4 slices for sandwich tops; evenly space remaining 4 slices on sheet.

7. Step 7.

   Melt butter in small saucepan over medium heat.

8. Step 8.

   Whisk in flour and cook for 1 minute.

9. Step 9.

   Slowly whisk in milk and bring to boil.

10. Step 10.

    Once boiling, remove from heat and quickly whisk in Gruyère, Parmesan, salt, pepper, and nutmeg until smooth.

11. Step 11.

    Spread 1 tablespoon Mornay on each slice of toast on sheet.

12. Step 12.

    Fold ham slices over themselves multiple times so they bunch up, divide ham evenly among slices of toast.

13. Step 13.

    Spread 2 tablespoons Mornay on 1 side of each reserved slice of toast and place slices Mornay side down on top of ham.

14. Step 14.

    Spread 2 tablespoons Mornay evenly over top of each sandwich, making sure to completely cover toast, including edges.

15. Step 15.

    Sprinkle sandwiches with Parmesan, followed by Gruyère.

16. Step 16.

    Bake until cheese on top of sandwiches is melted, about 5 minutes.

17. Step 17.

    Turn on broiler and broil until cheese bubbles across tops of sandwiches and edges are spotty brown, about 5 minutes.

18. Step 18.

    Serve.