Prepare pasta according to package directions. Set aside.  Sautee mushrooms and onion in vegetable oil for 3 minutes or until limp.  Stir in flour. Add chicken broth and milk stirring over medium heat until mixture thickens and bubbles.  Add tuna, paprika, salt and pepper; stir and cook for 2 more minutes or until heated through. Pour mixture over pasta and top with cheese and parsley.