Saute mushrooms in butter for 5 minutes. Add flour; stir 2 minutes. Stir in milk slowly. before it gets too thick, add Worcestershire sauce, cheese, salt and pepper. Layer in oiled casserole half sliced potatoes, half eggs, and half cheese sauce; repeat. Top with toasted ground sesame seeds; bake at 350 degrees for 20 to 30 minutes.
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