Easy Beef Stroganoff

Directions

1. 1
   Prepare noodles as directed.
2. 2
   In small bowl, mix flour, mustard, salt and pepper.
3. 3
   Stir in small amount of mushroom liquid until creamy.
4. 4
   Cook onion in butter for about 5 minutes.
5. 5
   Add meat and cook until done.
6. 6
   Add mushrooms and liquid, then add flour mixture.
7. 7
   Stir over medium heat until mixture is thickened.
8. 8
   Stir in sour cream.
9. 9
   Serve over noodles.