Preheat oven to 375oF. Butter (or spray) a glass Pyrex dish. Peel the plantains and place in the dish. Sprinkle half the sugar over them. Add the dry wine and stick little pieces of the cinnamon sticks into the plantains.
Sprinkle with the rest of the sugar and the powdered cinnamon. Cut the butter in little pieces and dot over the plantains. Bake for approximately one hour.
By the way, this is a side dish, not dessert. It is very good served along with a roast and fluffy white rice.