This recipe is courtesy of Agropur.

1. Whisk eggs, milk, and salt in a bowl. Set aside. 
2. Place bread slices on a cutting board. 
3. Divide 310 mL (1½ cups) Jarlsberg cheese onto bread slices. Lay two slices of ham on four of the bread slices. Close with remaining four slices to make sandwiches.
4. Briefly soak each side of each sandwich in reserved egg mixture. Garnish one side with two sage leaves and sprinkle with some cheese. 
5. Grill each sandwich over low heat for 3 to 4 minutes per side, or until crisp and golden.