Line a deep casserole dish with a layer of bread slices spread with prepared mustard. Then alternate bread layers with grated crowley cheese sliced thinly.
Repeat until the bowl is full. Beat up several eggs, as many as your conscience will allow with sufficient milk to flood the casserole and bake in a 350 degree oven until it balloons like a popover. When removed from the oven the balloon will collapse and the dish is ready to serve.