Slimmed-Down Scalloped Potatoes

Cut 1 clove garlic in half and rub vigorously over the inside of a shallow 2-quart baking or gratin dish. Coat the dish with cooking spray. Mince the remaining 2 cloves garlic.

Combine the minced garlic, potatoes, milk, onion, salt, nutmeg and pepper in a medium heavy saucepan. Bring to a simmer over low heat, stirring occasionally. Simmer, uncovered, until the potatoes are tender, about 10 minutes. Transfer the potatoes to the prepared dish with a slotted spoon.

Transfer 1/4 cup of the milk mixture to a small bowl. Whisk in sour cream. Pour over the potatoes. Top with Parmesan.

Preheat broiler. Spoon the sour cream mixture evenly over the potatoes and broil until golden brown, about 2 to 3 minutes. Serve immediately.