INGREDIENTS
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1 tablespoon unsalted butter, softened
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1 1/2 pounds russet potatoes (roughly 4 large potatoes), peeled and thinly sliced (preferably with a mandoline for even, thin cuts)
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1/2 cup chopped onion
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2 garlic cloves, minced
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1 1/4 cups shredded Parmigiano Reggiano
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1 teaspoon fresh thyme
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1/2 teaspoon salt
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1/4 teaspoon pepper
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1 cup heavy whipping cream