"The crust on top is simply amazing...."
INGREDIENTS
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1 tablespoon unsalted butter, for greasing pan
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2 cups heavy cream
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2 cloves garlic, minced
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1 teaspoon fresh thyme leaves, finely chopped
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2 1/4 pounds medium Yukon Gold potatoes, scrubbed (about 8)
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1/3 cup grated Parmesan, divided
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1 1/2 cups (4 1/2 ounces) shredded Gruyere or Swiss cheese
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Salt and pepper to taste