Slice the zucchinis in half lengthwise and scoop out the seeds and some flesh to create boats.
In a mixing bowl, combine the shredded chicken, buffalo sauce, cream cheese, 1/2 cup of shredded cheddar cheese, garlic powder, onion powder, salt, and pepper. Mix well until fully combined.
Spoon the buffalo chicken mixture into each zucchini boat, packing it lightly.
Place the stuffed zucchini boats on a baking sheet lined with parchment paper.
Top each boat with the remaining 1/2 cup of shredded cheddar cheese.
Bake in the preheated oven for 25-30 minutes, or until the zucchinis are tender and the cheese is bubbly and golden.
Remove from the oven and sprinkle with sliced green onions and fresh parsley, if using.
Notes
Adjust the buffalo sauce to your spice preference.