To bake: I like the baking method best, I think it's easiest! Preheat your oven to 400 degrees F. Poke each sweet potato firmly with a fork, two pokes on each side.
Place on a pan lined with tin foil. Pop them in the oven and roast at 400 for 45-60 minutes until completely tender. You should be able to stick a butter knife all the way through with very little resistance. The thicker your sweet potatoes, the longer it will take.