Preheat oven to 400°F (200°C) and line a baking sheet with parchment paper.
Prick sweet potatoes several times with a fork and place them on the prepared baking sheet.
Bake sweet potatoes for 45 to 50 minutes, or until fork-tender.
In a medium bowl, mix the shredded chicken, buffalo sauce, melted butter, garlic powder, salt, and pepper until well combined.
Slice the cooked sweet potatoes open lengthwise and gently fluff the interior with a fork.
Distribute the buffalo chicken mixture evenly into the center of each sweet potato.
Place the stuffed potatoes back in the oven for 5 minutes to ensure the filling is hot.
Remove from oven and drizzle with ranch or blue cheese dressing.
Garnish with sliced green onions and crumbled blue cheese before serving.