Slice the zucchinis in half lengthwise and scoop out the center using a spoon, creating boats. Set the scooped-out zucchini flesh aside.
In a large bowl, combine the shredded chicken, hot buffalo sauce, softened cream cheese, half of the cheddar cheese, and half of the chopped green onions. Mix well until the ingredients are fully incorporated.
Season the mixture with salt and pepper to taste.
Spoon the buffalo chicken mixture into each zucchini boat, pressing it down gently to pack it in.
Transfer the filled zucchini boats to a baking dish and sprinkle the remaining cheddar cheese on top.
Bake in the preheated oven for 25-30 minutes, or until the zucchinis are tender and the cheese is bubbly and golden brown.
Once out of the oven, let them cool for a couple of minutes, then garnish with the remaining chopped green onions and freshly chopped parsley before serving.