Directions:

• Cook spaghetti in a large pot of boiling salted water until al dente. Drain well.
• Over a medium-low heat melt butter in a medium saucepan. Add onion to melted butter and stir until onion is soft. Add shrimp and mushrooms, cook for 5 minutes stirring often. Remove shrimp mixture from saucepan, place in a medium size bowl and set aside.
• Remove saucepan from heat. Combine flour, mayonnaise, salt, milk, and sherry in the saucepan. Mix well. Return the saucepan to the heat and cook until sauce thickens.
• Pour sauce into the bowl containing the shrimp mixture. Add the spaghetti to the bowl and mix well.
• Place all ingredients in a 1-1/2 quart casserole dish (baking pan). Sprinkle the parmesan cheese on top of the mixture. Bake at 350 degrees F (175 degrees C) for 30 minutes.