"Get Sheet-Pan Scalloped Potatoes Recipe from Food Network..."
INGREDIENTS
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Canola spray, for the baking sheet
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2 tablespoons unsalted butter
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1 1/2 cups thinly sliced yellow onion (1 large onion)
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1 tablespoon minced garlic (2 to 3 cloves)
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3 1/4 pounds medium Yukon Gold potatoes (6 to 7 potatoes), cut into 1/8-inch rounds
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Kosher salt and freshly ground black pepper
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1 1/2 cups grated fontina cheese (about 8 ounces)
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1 cup grated Parmesan (about 5 ounces)
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2 cups heavy cream
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2 tablespoons finely chopped fresh rosemary
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1 tablespoon Dijon mustard
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1 teaspoon lemon zest