Twice-Baked Sweet Potatoes submitted by Cathy E.   Ingredients 4  8oz. sweet potatoes 1/4 cup parmesan cheese 1 tbsp. butter 1/4 cup sharp cheddar 1 tsp. salt 1/4 tsp. pepper   Bake sweet potatoes @ 425o for 45 minutes. Scoop out flesh, leaving 1/4 inch shell. Mash flesh with remaining ingredients. Spoon into shells & bake 20 minutes or until shell is crispy.