Ingredients Original recipe yields 8 servings Ingredient Checklist cooking spray (such as Pam®) 2 cups diced cooked ham 2 tablespoons butter, or as needed 7 slices bread, crusts removed ½ pound American cheese, cubed 3 cups milk 6 eggs, beaten ¾ teaspoon dry mustard ¾ teaspoon salt Directions Instructions Checklist Step 1 Spray a 9×13-inch casserole dish with cooking spray. Step 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. Step 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. Step 4 Preheat oven to 350 degrees F (175 degrees C). Remove aluminum foil from casserole. Step 5 Bake in the preheated oven until cheese is melted and eggs are set in the middle, about 1 hour.