Ruth’s Chris Potatoes au Gratin Servings: 6–8 Time: 1 hour 10 minutes ✅ Ingredients 2 pounds russet potatoes, peeled and thinly sliced 1 cup heavy cream 1 cup whole milk 1 ½ cups shredded sharp cheddar cheese 1 cup grated Parmesan cheese 2 tablespoons butter 2 tablespoons flour 1 small onion, finely diced (optional but recommended) 2 garlic cloves, minced 1 teaspoon salt ½ teaspoon black pepper ¼ teaspoon nutmeg (optional, classic French flavor) Fresh parsley for garnish (optional) ✅ Instruction