Slice the tops off the bell peppers and remove the seeds and membranes. Place them upright in a baking dish.
In a mixing bowl, combine the shredded chicken, cream cheese, buffalo sauce, garlic powder, onion powder, salt, and pepper. Mix well until all the ingredients are thoroughly incorporated.
Gently fold in the shredded cheddar cheese and the chopped green onions, reserving some green onions for garnish.
Carefully spoon the buffalo chicken mixture into each empty bell pepper until they are generously filled.
Cover the baking dish with aluminum foil and bake in the preheated oven for 25 minutes.
Remove the foil and bake for an additional 10-15 minutes, or until the peppers are tender and the tops are browned.
Once done, remove from the oven and let cool slightly before serving.
Garnish with the reserved green onions and fresh cilantro or parsley if desired.
Notes
Adjust buffalo sauce to taste for desired spiciness.