Tony's Manicotti With Four Cheeses

Ingredients

some pepper to
some salt
1 onion
1 lb mushrooms
1/2 c butter
1/2 c flour
4 c milk
12 manicotti shells
1 ricotta
4 oz mozzarella cheese
1/2 c romano cheese
1/4 c walnuts
1/4 c parsley
3 eggs
1 ds nutmeg

Instructions

golden.