These Low Calorie Sweet Potato Casserole Bites are just 12 calories each, so you can have 16 of them for less than 200 calories!I like to use homemade marshmallows, but you can absolutely use store bought. Just try to get the really big ones so you can slice them easier.Special Tip: Slicing marshmallows can be sticky, so don't feel like they all have to be perfect. Upi can use kitchen scissors to make it a bit easier.