Ingredients:
| 4
| large | Russet potatoes, scrubbed | | 1
| tbsp | Butter or margarine | | 1/2
| cup | Chopped onion | | 1/2
| cup | Milk | | 5
| tsp | Cornstarch | | 1/4
| cup | Buttermilk | | 1/2
| cup | Marsala or madiera | | 1
| cup | Shredded Jack cheese | | 8
| oz | Cooked ham, cut into | | | -Julienne strips | | 1
| tbsp | Dijon mustard | | 1
| tbsp | Prepared horseradish | | | Chopped parsley | | | Salt | | | Pepper |
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