Potatoes Au Gratin

• 1 shallot, peeled, quartered ↔ Replace
• 4 garlic cloves, peeled, smashed ↔ Replace
• 2 c. heavy cream ↔ Replace
• 2 c. whole milk ↔ Replace
• 2 to 3 thyme sprigs, plus 1 1/2 tsp. fresh thyme leaves, divided ↔ Replace
• Unsalted butter, for greasing ↔ Replace
• 2 1/2 lb. Yukon Gold potatoes (about 5 medium) ↔ Replace
• 1 tbsp. kosher salt ↔ Replace
• 6 oz. Gruyère, coarsely shredded (about 1 1/2 cups), divided ↔ Replace
• 2 oz. Parmesan, finely shredded (about 1 cup), divided ↔ Replace

Converted measurements are approximate; the original source remains authoritative.

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