Classic Potato Gratin

Ingredients

• 5 garlic cloves, divided
• 1 tablespoon unsalted butter, room temperature
• 2 medium shallots, quartered through root ends
• 2½ cups heavy cream
• 1 tablespoon kosher salt
• 1 teaspoon freshly ground black pepper
• 1 tablespoon thyme leaves, plus more
• 4 pounds russet potatoes, scrubbed, very thinly sliced on a mandoline
• 3 ounces Gruyère, finely grated
• 1 ounce Parmesan, finely grated

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