Preheat the Oven:
Preheat your oven to 375°F (190°C).
Assemble the Ingredients:
In a 9x13-inch baking dish, combine the uncooked pasta, chicken broth, Buffalo sauce, ranch dressing, and cream cheese. Stir to distribute the cream cheese evenly.
Add the Chicken:
Place the diced chicken evenly over the pasta mixture. Stir gently to combine.
Bake Covered:
Cover the baking dish tightly with aluminum foil and bake for 30 minutes.
Stir and Top with Cheese:
After 30 minutes, remove the dish from the oven, stir everything to ensure even cooking, and sprinkle the mozzarella and cheddar cheese evenly on top.
Finish Baking:
Return the dish to the oven, uncovered, and bake for an additional 15–20 minutes or until the pasta is tender and the cheese is melted and bubbly.
Garnish and Serve:
Let the dish cool for a few minutes before serving. Garnish with chopped green onions and crumbled blue cheese, if desired.