Preheat your oven to 400°F (200°C).
Wash the sweet potatoes thoroughly and pat them dry.
Using a fork, prick each sweet potato several times all over.
Place the sweet potatoes on a baking sheet lined with parchment paper.
Bake for 45-60 minutes, or until the potatoes are tender when pierced with a fork.
While the potatoes are baking, prepare the filling. In a medium bowl, combine the shredded chicken, buffalo sauce, and Greek yogurt. Mix well.
Chop the green onions and celery.
Once the sweet potatoes are done, remove them from the oven and let them cool for 5-10 minutes.
Cut a slit lengthwise in each potato, being careful not to cut all the way through.
Gently squeeze the sides of each potato to open them up and create a pocket for the filling.
Divide the buffalo chicken mixture evenly among the four potatoes, stuffing it into the pockets.
Top each potato with a tablespoon of blue cheese or ranch dressing.
Sprinkle the chopped green onions and celery over each potato.
If desired, drizzle with extra buffalo sauce and sprinkle with blue cheese crumbles.
Serve immediately while still warm.