01 - Preheat oven to 375°F. Grease a 9x13-inch casserole dish with butter or nonstick cooking spray.
02 - In a large mixing bowl, combine the softened cream cheese, ranch dressing, and buffalo wing sauce. Stir until smooth and creamy with no lumps remaining.
03 - Fold in the shredded chicken, cooked pasta, 1 1/2 cups of cheddar cheese, and 1/2 cup of mozzarella cheese. Mix until all ingredients are evenly coated and well distributed.
04 - Transfer the mixture into the prepared casserole dish, spreading it into an even layer. Top with the remaining 1/2 cup cheddar and 1/2 cup mozzarella cheese.
05 - Sprinkle blue cheese crumbles and panko breadcrumbs over the top for added flavor and crunch, if desired.
06 - Bake uncovered for 30 to 35 minutes, or until the cheese is melted, bubbly, and golden brown on top.
07 - Remove from the oven and garnish with thinly sliced green onions. Let rest for 5 minutes before serving hot.