Spray 13x9 casserole with cooking spray.

Place ham or sausage evenly in the bottom of the casserole.

Layer cubed bread over top of meat, then add cubed cheddar in another layer.

In a mixing bowl, combine eggs, milk, garlic salt, Maggi and Tabasco.

Pour egg mixture over top of layers in casserole.

Mix flour and mustard and sprinkle over top of casserole.

Drizzle melted butter over everything.

Using spatula, press mixture down evenly so bread soaks up egg mixture.

Cover and refrigerate overnight.

Bake at 350 for one hour.