The addition of parsnips is an elegant twist to this traditionally all-potato dish. Parboiling and drying the sliced parsnips and potatoes first will keep them from absorbing the sauce in the oven so the gratin stays creamy. Half-and-half is our dairy of choice for this dish—a combination of equal parts cream and whole milk that gives the sauce its body while keeping the saturated fat at just 3g per serving. Toss the vegetables gently with the sauce so the slices don’t fall apart.
Bring potato and parsnip slices to a boil in a large Dutch oven filled with water. Reduce heat, and simmer 6 minutes (slices should be slightly undercooked at the center). Reserve 1/2 cup cooking liquid; drain. Arrange potato and parsnip slices in a single layer on a baking sheet; cool.
Heat oil in a medium saucepan over medium-high; stir in flour. Stir in reserved 1/2 cup cooking liquid, half-and-half, 1/2 teaspoon salt, and pepper; bring to a boil. Cook 2 minutes or until slightly thickened. Stir in Gruyère cheese; cook 1 minute. Remove pan from heat. Add potato and parsnip slices, remaining 1 teaspoon salt, and parsley; toss gently to combine. Spoon potato mixture into a 2-quart baking dish coated with cooking spray; sprinkle with Parmigiano-Reggiano cheese. Bake at 350°F for 45 minutes or until golden brown.
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