Wash and cut off any bad spots on sweet potatoes
Bake in a 350 degree oven till done, approximately one hour
When cool peel the baked sweet potatoes
Cut peeled sweet potatoes in half or thirds depending on size and place in a 9x9 baking dish
Add a small piece of butter on top of each potato piece
Sprinkle brown sugar over the top
Pour syrup over the potatoes and cover with foil
Bake in pre-heated 350 degree oven for 20 minutes
Remove foil and bake for another 10 minutes
Now the fun part - cover potatoes with marshmallows, turn oven to broil - watch close as they will burn quickly, when marshmallows are melted and toasted remove from oven and serve.