Ham Tetrazzini

Directions

1. 1
   Cook vermicelli according to package directions; return to pan.
2. 2
   Drain liquid from mushrooms and add enough water to make 1 cup; dissolve the bouillon cubes in this liquid.
3. 3
   In a medium saucepan, saute the onion in the margarine until soft.
4. 4
   Stir in flour and mustard; cook, stirring constantly, just until bubbly.
5. 5
   Stir in the milk and the mushroom liquid mixture.
6. 6
   Cook and stir until the sauce thickens and boils for 1 minute.
7. 7
   Pour sauce over vermicelli, then stir in mushrooms and ham.
8. 8
   Pour into a baking dish that has been sprayed with nonstick spray.
9. 9
   Sprinkle with Parmesan. (Amount to taste, but I think it tastes best with the top surface of the casserole pretty much covered.)
10. 10
    Bake at 350° about 1/2 hour, or until bubbly hot.