INGREDIENTS
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2 tablespoons unsalted butter
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1 medium onion minced
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2 gloves garlic minced
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1 tablespoon chopped fresh thyme
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1 1/4 teaspoons table salt
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1/4 teaspoon ground black pepper
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2 1/2lbs russet potatoes
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peeled and sliced into about 1/8" thick rounds
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1 cup low-sodium chicken broth
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1 cup heavy cream
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2 bay leaves
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1 cup grated sharp cheddar cheese
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1/2 cup parmesan cheese