01 - Preheat oven to 400°F. Scrub sweet potatoes thoroughly, pierce each several times with a fork, and arrange them on a lined baking sheet. Bake for 45 to 50 minutes or until completely tender.
02 - While sweet potatoes roast, heat butter in a skillet over medium heat. Add diced apples, cinnamon, nutmeg, and a pinch of salt. Sauté for 5 to 6 minutes until apples soften. Stir in chopped walnuts and maple syrup, continuing to cook for another 2 minutes. Remove skillet from heat.
03 - When cool enough to handle, slice each roasted sweet potato down the center without cutting all the way through. Gently open and fluff the interior with a fork.
04 - Distribute the warm apple-walnut mixture evenly inside the sweet potatoes. If desired, finish with dried cranberries and chopped parsley.
05 - Serve immediately as a satisfying main or side while the sweet potatoes are hot.