Cook the penne pasta according to package directions until al dente. Drain and set aside.
In a large mixing bowl, combine the shredded chicken and buffalo sauce, mixing until the chicken is well coated.
Add the softened cream cheese, garlic powder, onion powder, and half of the mozzarella cheese to the chicken mixture. Stir until everything is evenly combined.
Gently fold in the cooked pasta, blue cheese crumbles, and chopped green onions. Season with salt and pepper to taste.
Transfer the mixture to a greased 9x13 inch baking dish, spreading it out evenly.
Sprinkle the remaining mozzarella cheese over the top of the pasta bake.
Place the dish in the preheated oven and bake for 20-25 minutes, until the cheese is melted and bubbly.
Once baked, let it cool for a few minutes before garnishing with fresh parsley.
Notes
Serve hot with additional chopped green onions and a drizzle of buffalo sauce for garnish.