| 2 Medium Potatoes, pared and cut into 1/2-inch cubes |
| 3 Tbs Butter |
| 3/4 Cup Onion, finely chopped |
| 1/4 Cup Celery, finely chopped |
| 3 Tbs All-purpose flour |
| 3 Cups Milk |
| 1/4 Tsp Pepper |
| 1/4 Tsp Salt |
| 2 Tsp Dijon-style mustard |
| 1 Cup Ham, finely chopped |
| 1 1/2 Cups Sharp cheddar cheese, grated |