Cook the pasta, as directed, to al dente. Drain well.
Preheat oven to 350 F.
In a large mixing bowl, toss together the sour cream, buffalo wing sauce, Ranch dressing mix and half of the shredded cheese. Stir in the shredded rotisserie chicken.
Pour the drained pasta into the bowl and toss with the cheesy mixture. Pour into baking dish and top with remaining shredded cheese.
Bake in the preheated oven for 15 to 20 minutes, or until warmed through and cheese is melted on top.
Prepare the salad.
Serve Buffalo Ranch Mac n Cheese Bake with crumbled blue cheese garnish and salad.