Food & Cooking Recipes Healthy Recipes Gluten-Free Recipes Roasted Japanese Sweet Potatoes 5.0 (1) Close Credit: Johnny Miller Prep Time: 5 mins Total Time: 1 hr 5 mins Yield: 4 This mouthwatering baked sweet potato is loaded with fiber and vitamin C. Directions Preheat oven to 400 degrees. Prick sweet potatoes all over with a fork; arrange on a parchment-lined baking sheet. Roast until very tender, about 1 hour, depending on size. Split open, drizzle with olive oil, and season with salt and pepper; serve.