Ingredients
- 12 ounces reserved corned beef brisket, coarsely chopped*
- 3 teaspoons butter, divided
- 1/2 cup chopped onion
- 2 teaspoons chopped fresh thyme
- 2 tablespoons reserved horseradish-butter mixture*
- 2 cups reserved potato halves*
- 1 cup shredded Swiss cheese
- 1/4 cup shredded Parmesan cheese


