1/4 cup butter
2 large onions, halved and sliced (about 5 cups)
4 carrots, peeled, cut into 1/2-inch pieces (about 2 cups)
4 parsnips, peeled, cut into 1/2-inch pieces (about 1 cups)
2 (14 1/2 ounce) cans low sodium chicken broth (or more, to taste) or 2 (14 1/2 ounce) cans vegetable broth (or more, to taste)
3 large red potatoes, cut into 1/2-inch pieces (about 2 1/2 cups)
1/4 cup chopped fresh parsley
1 teaspoon fresh thyme
1 1/4 cups milk or 1 1/4 cups half-and-half
1/8-1/4 cup sherry wine (could also try dry white wine)

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