I use unsalted butter. However, you can use salted butter if that is what you have handy. Just season the sweet potatoes lightly with salt.
Calories: 299 kcal, Carbohydrates: 44 g, Protein: 3 g, Fat: 12 g, Saturated Fat: 3 g, Cholesterol: 11 mg, Sodium: 133 mg, Potassium: 610 mg, Fiber: 5 g, Sugar: 16 g, Vitamin A: 24265 IU, Vitamin C: 4 mg, Calcium: 64 mg, Iron: 1.3 mg