This dish is best when prepared with whole-milk yogurt, but low-fat yogurt can be substituted. For a spicier dish, do not remove the ribs and seeds from the chile. If you prefer, substitute 2 teaspoons ground coriander, 1/4 teaspoon ground cardamom, 1/4 teaspoon ground cinnamon, and 1/2 teaspoon ground black pepper for the garam masala. The sauce can be made ahead, refrigerated for up to 4 days in an airtight container, and gently reheated before adding the hot chicken. Serve with basmati rice.