Sweet potatoes are a dynamite source of beta-carotene (their bright orange color is a dead giveaway). Your body converts beta-carotene to vitamin A, a nutrient that helps to continually generate new, healthy skin cells. I like to turn sweet potatoes into crispy oven-baked french fries: Cut peeled potatoes into ¼-inch strips and spread them in a single layer on a baking sheet coated with oil spray. Mist the fries with oil spray and season with salt, black pepper, or any other seasonings (ground cinnamon, curry powder, and chili powder are all fun options). Bake in a 400° oven for 20 minutes, flipping the fries halfway through. Finish your fries under the broiler for 5 minutes to get them extra crispy!