Spray both sides of the sweet potatoes with butter and sprinkle with cinnamon.
Place foil over the grilling grates and place the sweet potatoes directly onto the foil.
Spray the sweet potatoes again with a little butter. (To keep the potatoes from sticking to the foil)
Close the grill lid and cook for about 30 minutes. Make sure to turn and flip the sweet potatoes every 10 minutes and add additional sprays of butter to keep from sticking.
*Nutritional information is a calculated guesstimate. Please note that this can change with different brands and modifications you may make to the recipe. For the most accurate information, use a nutritional calculator with the exact brands and measurements you're using with each recipe.