Sweet potatoes can be baked, boiled, steamed, or microwaved. To bake sweet potatoes, preheat the oven to 400°F (205°C), wash and dry the sweet potatoes, prick them a few times with a fork, rub them with oil or butter, and bake for 45-60 minutes. To boil sweet potatoes, peel and chop them into chunks, bring a pot of water to a boil, add the sweet potatoes, and boil for 15-20 minutes until soft. Drain and mash them with some butter, salt, and pepper. To steam sweet potatoes, chop them into chunks, and steam them for 20 minutes until tender. Serve with some butter and cinnamon. To microwave sweet potatoes, wash and dry them, prick them a few times with a fork, place them on a microwave-safe plate, and microwave on high for 5-6 minutes per potato, until tender. Serve with some brown sugar and maple syrup.