Mozzarella Potatoes au Gratin

1. 1

   Cook potatoes in boiling water 20 min.

2. 2

   or just until tender; drain.

3. 3

   Return to pan; cover with cold water.

4. 4

   Let stand until cooled.

5. 5

   Meanwhile, melt butter in medium saucepan on medium heat.

6. 6

   Add onions; cook and stir 2 min.

7. 7

   Blend in flour; cook 1 min.

8. 8

   Gradually add milk; cook 5 min.

9. 9

   or until thickened, stirring constantly.

10. 10

    Add 1-1/4 cups mozzarella; cook and stir 1 min.

11. 11

    or until melted.

12. 12

    Stir in mustard.

13. 13

    Heat oven to 375F.

14. 14

    Peel potatoes; cut into 1/4-inch-thick slices.

15. 15

    Layer alternately with cheese sauce in 2-qt.

16. 16

    casserole sprayed with cooking spray, ending with sauce.

17. 17

    Bake 25 to 30 min.

18. 18

    or until heated through.

19. 19

    Top with remaining cheeses; bake 5 min.

20. 20

    or until mozzarella is melted.

* Per serving · 4 servings · Values may vary.

No additional tips available.