Peel and boil your sweet potatoes until they are nice and soft. Run them through a ricer so they come out perfectly smooth into your mixing bowl. ThenĀ add half of your brown sugar, half of your marshmallows, half your stick of butter and all of your cinnamon into the sweet potatoes.
Once it's all mixed together pour this into a casserole dish. This next step is optional, but some folks really like it. You add a crumble topping to the dish.
Take the rest of your butter, melt it and then add the rest of your brown sugar, flour, and regular sugar. Work these together so they become as the word suggests, a CRUMBLE!
Spread these over the dish, and then add the rest of your marshmallows too. Bake in the oven, until the marshmallows turn golden brown.
Enjoy!
*If you want to make this ahead of time you can, just add the topping 30 minutes before serving, bake and serve hot!