Per serving
This recipe goes back a long time. Its comfort food at its best.
Preheat oven at 350.
In a medium saucepan melt butter. Add flour and cook for one minute to remove rawness.
Add milk gradually, carefully avoiding lumps. Also add salt, pepper, mustard, cheese and beaten egg yolks till everything is well incorporated.
Remove from fire and cool slightly.
Beat egg whites till stiff and lightly incorporate into the white sauce.
Line botom of casserole dish with bread slices, buttered side up and top with white sauce.
Bake till puffed and browned, almost like a cake.
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