Sandwich French Toast Casserole - cooking recipe

Ingredients

cooking spray
6 slices whole wheat bread, or more to taste
1 tablespoon butter, or as needed
12 slices deli ham, or more to taste
6 slices Swiss cheese, or more to taste
1/2 cup milk
4 eggs
1 teaspoon Worcestershire sauce
1/2 teaspoon mustard powder
salt and ground black pepper to taste

Preparation

Preheat oven to 350 degrees F (175 degrees C). Spray the inside of a 9x13-inch casserole dish with cooking spray.
Spread butter on one side of each bread slice; top each bread slice with 2 slices ham and 1 slice Swiss cheese. Arrange open-faced sandwiches in the prepared casserole dish, overlapping them to fit.
Whisk milk, eggs, Worcestershire sauce, mustard powder, salt, and pepper together in a bowl; pour milk mixture over the open-faced sandwiches. Allow milk mixture to soak in for at least 15 minutes.
Bake in the preheated oven until eggs are set and casserole is cooked through, about 20 minutes.