Step 1: Cook the Pasta Until Tender and Prepare the Buffalo Ranch Sauce - Start by bringing a pot of salted water to a boil and cooking the rotini pasta according to the package directions, which usually takes about 10 minutes. You want the pasta tender but still holding its shape so it does not get mushy later. Once it is done, drain it well and rinse it under cold water to cool it down completely. This step is important because warm pasta will soak up too much dressing and change the texture. While the pasta cools, grab a small bowl and mix together the ranch dressing and buffalo wing sauce. Stir until it is smooth and fully combined. This creamy buffalo ranch sauce is where all that bold flavor comes from, so give it a quick taste and adjust if you want a little more kick.
Step 2: Combine the Pasta, Chicken, and Fresh Ingredients in a Large Bowl - In a large mixing bowl, add your cooled rotini pasta first, then layer in the shredded chicken, diced celery, shredded cheddar cheese, and sliced green onions. This is where the salad really starts to come together with a mix of textures from creamy to crunchy. Sprinkle the garlic powder and black pepper evenly over the top so the seasoning is well distributed throughout the dish.
Step 3: Toss Everything Together Until Creamy and Well Coated - Pour the prepared buffalo ranch sauce over the pasta mixture. Using a large spoon or spatula, gently toss everything together until all the ingredients are evenly coated in that creamy, spicy dressing. Take your time here and make sure you get all the way to the bottom of the bowl so nothing gets left out. Every bite should have a little bit of everything.
Step 4: Chill the Pasta Salad to Let the Flavors Develop - Once everything is mixed, cover the bowl with plastic wrap and place it in the fridge for about 30 minutes. This step might be tempting to skip, but it really makes a difference. The flavors settle, the sauce thickens slightly, and everything just tastes more balanced.
Step 5: Give It a Final Toss and Serve - Before serving, take the pasta salad out of the fridge and give it one more gentle toss. If it looks a little dry, you can add a small splash of ranch or buffalo sauce to freshen it up. Scoop it into bowls, maybe sprinkle a little extra cheese or green onions on top, and enjoy every creamy, tangy bite.