Chicken Casserole

Directions

1. 1
   Melt butter.
2. 2
   Saute onion.
3. 3
   Remove from heat.
4. 4
   Stir in flour, salt and pepper.
5. 5
   Drain mushrooms, reserve liquid, add enough water to make 1/2 cup liquid.
6. 6
   Gradually stir liquid into flour mixture.
7. 7
   Put back to heat.
8. 8
   Stir in evaporated milk.
9. 9
   Add mushrooms.
10. 10
    Cook over medium heat until thickened.