Preheat oven to 400 degrees F. Butter 13 by 9 by 2-inch glass baking dish.
Mix first 7 ingredients in large pot. Bring to simmer over medium-high heat. Add half of cheese; whisk until smooth. Chill remaining cheese. Transfer potato mixture to prepared dish, spreading evenly. Cover with foil; bake 15 minutes. Uncover and bake until potatoes are very tender and liquid bubbles thickly, about 50 minutes. Dot potatoes with remaining cheese. Bake until cheese softens, about 5 minutes. Let cool 15 minutes before serving.
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