01 - Preheat oven to 375°F. Grease a 9x13-inch casserole dish with non-stick spray or butter.
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 the shredded chicken, cooked pasta, 1 1/2 cups of cheddar cheese, and 1/2 cup of mozzarella cheese into the sauce mixture. Mix until all ingredients are evenly coated and well combined.
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 cheeses.
05 - If desired, sprinkle blue cheese crumbles and panko breadcrumbs over the top for extra flavor and crunch.
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.