INGREDIENTS
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1 (14.1-oz.) package refrigerated piecrusts
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1 tablespoon chopped fresh rosemary
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1/4 teaspoon freshly ground pepper
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2 cups (8 oz.) shredded Gruyère cheese, divided
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1 1/2 pounds Yukon gold potatoes
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1 1/2 pounds sweet potatoes
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1 teaspoon kosher salt
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2/3 cup heavy cream
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1 garlic clove, minced
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Garnish: fresh rosemary sprigs