A smoky twist on a Holiday classic, this Grilled Sweet Potato Casserole is easily made entirely on your pellet grill. Hearty sweet potatoes are smothered in butter then smoked until soft, and stuffed with crunchy pecans, brown sugar, cinnamon and mini marshmallows. The gooey marshmallows melt into the sweet potatoes with a slight char on top for a sweet and smoky Thanksgiving or Christmas side.