Ingredients

• cooking spray (such as Pam®)
• 2 cups diced cooked ham
• 2 tablespoons butter, or as needed
• 7 slices bread, crusts removed
• 1/2 pound American cheese, cubed
• 3 cups milk
• 6 eggs, beaten
• 3/4 teaspoon dry mustard
• 3/4 teaspoon salt

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Instructions

1. Spray a 9x13-inch casserole dish with cooking spray.
2. Spread ham into the bottom of prepared casserole dish. Butter one side of each bread slice; cut slices into cubes. Arrange buttered bread cubes atop ham; layer American cheese over bread cubes.
3. Whisk milk, eggs, mustard powder, and salt together in a bowl; pour over American cheese layer. Cover dish with aluminum foil and refrigerate 8 hours or overnight.
4. Preheat oven to 350 degrees F (175 degrees C). Remove aluminum foil from casserole.
5. Bake in the preheated oven until cheese is melted and eggs are set in the middle, about 1 hour.