Sweet Potato Casserole

4 - 8 sweet potatoes (depending on the size of the pan you use and the size of the potatoes)
1/4 ((1/2 stick) - 1/2 cup (1 stick) butter
1/2  - 1 cup brown sugar
1/2  - 1 bag marshmallows

Boil unpeeled sweet potatoes until easily pierced (not too soft, now). When cool, peel.

Preheat your oven to 350. Slice potatoes and layer in an 8 x 8 or a 9 x 13 pan. Thinly slice some of the butter and randomly drop them on the potatoes. Sprinkle some of the brown sugar over the top. Repeat until you have 3 or 4 layers. Sprinkle (if using mini-) or place (if using large) marshmallows, covering the potatoes. Bake until marshmallows are nicely browned.