1/4 cup butter
2/3 cup diced onion
1/4 cup flour
2 cups milk
1 teaspoon salt
1/4 teaspoon ground white pepper
1/2 teaspoon poultry seasoning
1/4 teaspoon ground mustard
2 cups grated Cheddar Cheese
1 can sliced mushrooms (do not drain)
1 pound cooked turkey, diced
Preheat oven to 400 degrees.
Boil pasta according to package directions, drain.
Melt the butter over med heat. Add the onion; cook and stir until tender. Stir in flour and seasonings until blended. Then add milk. Cook and stir until thickened. Remove from heat and gradually add about half the grated cheese. Add undrained mushrooms to the sauce and stir.
Layer half the spagehetti in a 9 x 13 inch greased pan. Cover with a layer of turkey and then a layer of sauce. Repeat. Sprinkle remaining cheese over the top. Bake about 20 mins.