Preheat the oven to 375°F (190°C).
In a large bowl, combine the shredded chicken, buffalo sauce, cream cheese, ranch dressing, and 1 cup of the cheddar cheese until uniform.
Arrange the pepper halves in a 9x13 inch baking dish with the hollow side facing up.
Divide the chicken mixture equally among the pepper halves.
Cover the baking dish with foil and bake for 20 minutes.
Remove the foil and top each pepper with the remaining 0.5 cup of cheddar cheese.
Return to the oven and bake uncovered for 10 minutes or until the cheese is melted and the peppers are tender.
Garnish with sliced green onions and serve immediately.