Scrub the russet potatoes thoroughly and prick them several times with a fork. Bake them directly on the oven rack for 45-60 minutes, or until they are fork-tender.
While the potatoes are baking, in a large mixing bowl, combine the shredded chicken, softened cream cheese, shredded cheddar cheese, chopped green onions, ranch dressing, garlic powder, onion powder, salt, and pepper. Mix until everything is well combined.
Once the potatoes are done baking, remove them from the oven and allow them to cool slightly. Cut each potato in half lengthwise and scoop out some of the potato flesh, leaving about a 1/4 inch shell.
Add the scooped potato flesh to the chicken mixture and stir well to combine.
Spoon the chicken mixture back into the potato skins, mounding generously.
If desired, sprinkle the top with cooked crispy chicken skin for added crunch.
Return the stuffed potatoes to the oven and bake for another 15-20 minutes or until they are heated through and the cheese is melty.
Remove from the oven and garnish with extra chopped green onions for freshness and color.