Preheat your oven to 350 degrees.
Prepare a 13x9 inch pan with cooking spray and set aside.
Arrange your toasted bread across the bottom of your prepared pan. Cut slices if you have to.
Sprinkle ham and then cheese over top of your toast.
Spread the ham and cheese around as evenly as possible.
In a medium sized bowl whisk together eggs, milk, salt, mustard, nutmeg and pepper.
Pour over top of the toast, ham and cheese.
Bake for between 22 and 30 minutes, or until golden brown and a toothpick inserted into the center comes out clean.
Allow to rest in your pan for 5 minutes. Serve and enjoy!