Sweet Potato French Fries December 1, 2021 Sweet potatoes are a good source of potassium and vitamin C. They also make a great side dish or soup. Check out the French fry recipe below, and pick up some sweet potatoes today from your local grocery store! Prep Time: 10 minutes. Cook Time: 30 to 40 minutes. Servings: 4 to 6. Ingredients 1 large sweet potato, sliced into 3-inch-long fries. 1 teaspoon olive oil. 1 tablespoon brown sugar. Cumin and chili powder as desired for flavor. Directions Preheat oven to 400 degrees. Toss sweet potatoes with oil. Add in brown sugar, chili powder and cumin. Place in one layer on a cookie sheet. Bake for 30 to 40 minutes until starting to brown.