Slice the zucchinis in half lengthwise and scoop out the seeds to create boats. Lightly brush the insides with olive oil and season with salt and pepper.
Place the zucchini halves on a baking sheet, cut side up, and bake in the preheated oven for 10 minutes to soften slightly.
While the zucchini is baking, prepare the filling. In a mixing bowl, combine the shredded chicken, buffalo sauce, cream cheese, half of the cheddar cheese, and chopped green onions. Mix until well combined.
Remove the zucchini from the oven and carefully fill each boat with the buffalo chicken mixture, packing it in tightly.
Top the stuffed zucchinis with the remaining cheddar cheese.
Return the stuffed zucchini boats to the oven and bake for an additional 15-20 minutes or until the cheese is bubbly and slightly golden.
Once done, remove from the oven and let cool for a few minutes. Garnish with extra green onions before serving.