INGREDIENTS
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1 tablespoon unsalted butter
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1 yellow onion, finely chopped
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2 cloves garlic, minced
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1 1/2 cups heavy cream
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1/2 cup low-sodium chicken broth
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2 teaspoons fresh thyme leaves
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1 1/2 teaspoon kosher salt
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1/2 teaspoon ground black pepper
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2 pounds russet potatoes, peeled and sliced into 1/8-inch slices
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1/2 cup shredded Cheddar
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1/2 cup shredded gruyere cheese