Process until they are in the sized bits you want to use. Combine all ingredients in a large bowl and stir to combine the ingredients. Store in the fridge. Heat oven to 375. Slice potatoes in half lengthwise, scoop out inside, leaving the thin shells intact.
Place shells in a baking pan.
In a large mixing bowl, beat sweet potatoes and remaining ingredients until there are no lumps. Return to oven for 15-20 minutes. For a lower calorie version, decrease margarine and add apple juice to moisten.