01 -
Preheat the oven to 350°F (175°C) and grease a 9x13-inch baking dish.
02 -
Bring a large pot of salted water to a boil. Cook spaghetti according to package directions until al dente. Drain well.
03 -
In a large mixing bowl, combine softened cream cheese, cream of chicken soup, sour cream, ranch seasoning mix, and black pepper. Blend until smooth.
04 -
Add cooked spaghetti and shredded chicken to the creamy mixture. Stir until pasta and chicken are thoroughly coated.
05 -
Spread the mixture evenly in the prepared baking dish. Sprinkle 1.5 cups of shredded cheddar cheese over the top, reserving 0.5 cup for later.
06 -
Bake in the preheated oven for 25 to 35 minutes or until hot and bubbling.
07 -
Remove the dish from the oven, top with remaining cheddar cheese, and return to oven for 5 to 10 minutes or until melted and golden.
08 -
Allow the casserole to rest for 10 minutes before slicing and serving.