In a large skillet, sauté the mushrooms and onion in oil until tender. Stir in the flour, Italian seasoning, bouillon, salt and pepper until smooth.
Gradually add milk, stirring constantly. Bring to a boil; cook and stir for 2 minutes or until thickened. Stir in the spaghetti, ham and peas; heat through. Sprinkle with the Parmesan cheese if desired.
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