There are lots of reasons to scallop sweet potatoes instead of plain white spuds. Vitamins A and E—both good for the immune system—are two. And since this recipe has only 3 grams of fat (versus the 9 grams or more in many homemade versions), you won't have to turn down seconds!
1. Preheat oven to 375°F. Coat 8 8-oz. ramekins or 9x13-inch baking dish with cooking spray.
2. Melt butter in large saucepan over medium heat. Add onion slices, and sauté until soft, about 7 to 10 minutes. Add broth, milk, garlic, thyme, nutmeg and bay leaf; bring to a simmer. Cook until liquid is reduced to just under 3 cups, about 7 minutes. Remove bay leaf, and season to taste with salt and pepper.
3. Add sweet potatoes to liquid. Return to a simmer, and cook, stirring occasionally, 5 minutes.
4. Pour mixture into ramekins or baking dish; bake 30 minutes for ramekins, 40 minutes for baking dish, basting potatoes occasionally with liquid in dish. Sprinkle cheese over potatoes, and bake ramekins 10 minutes; large dish 20 minutes. Let both rest 5 minutes before serving.