Four Cheese Manicotti Serves:  Ingredients: 1 large onion; minced   1 pound mushrooms, sliced   1/2 cup butter or margarine   1/2 cup flour   4 cups milk   1 1/2 ups parmesan cheese, grated   salt and pepper to taste   12 manicotti shells   1 pound deli-style ricotta   4 ounces mozzarella cheese, diced   1/2 cup romano cheese, grated   1/4 cup walnuts, finely chopped   1/4 cup parsley, chopped   3 eggs   1 dash nutmeg   Procedure: Saute onion and mushrooms in butter 5 minutes; stir in   flour. Gradually stir in milk; stir over low heat until   sauce bubbles and thickens. Stir in 1 cup Parmesan cheese   and salt and pepper to taste; set aside. Cook manicotti   shells according to package directions; drain and cover with   cold water. Mix together ricotta, mozzarella, Romano and   remaining Parmesan cheese; add walnuts, parsley and eggs.   Season to taste with salt, pepper and nutmeg. Drain manicotti   shells; stuff with cheese mixture. Place shells side by side   in a greased shallow baking pan; spoon sauce over all. Bake   in preheated 400 degree oven 20 to 25 minutes, or until   bubbly and golden. Posted by:  DFL924