Preheat oven broiler
Scoop out the inside of your sweet potato and place in a mixing bowl
Add melted butter, brown sugar and cinnamon and mix until combined.
Brown Eggo Waffle to your liking
Add sweet potato mixture to the top of your waffle and place on a cookie sheet
Add marshmallows
Place waffle under oven broiler until lightly brown and melted.
Remove from oven and Enjoy!