2 tbsp butter

2 tbsp flour

1/2 tsp salt

1/8 tsp white pepper (black if you don’t have the white)

1 cup milk

1 beaten egg

1/4 cup Parmesan cheese

Make a white sauce with the 1st five ingredients. Mix in egg and cheese. Pour over casserole. Bake 30 minutes at 350’ until golden and bubbly on top.