Preheat oven to 375.
Place sweet potatoes on a baking sheet and bake until tender, about an hour.
Remove from oven and let cool.
Split potatoes, remove the flesh, and place in a large bowl.
Add butter, sugar, nutmeg, and cinnamon to the bowl, and mix together well.
Evenly distribute the sweet potatoes into 4 bowls. Top each bowl with 1 TBSP of bread crumbs.