Bring 4 cups of salted water to a boil. Prepare pasta al dente according to package directions. Drain, rinse and set aside.
Return the pot to the stove over medium low heat and melt the butter. Add minced garlic and cook for 30 seconds.
Next, add the hot sauce. Whisk until combined. Add diced onions and cover. Cook for 10 minutes.
Use a blender or food processor to purée the buffalo sauce. (Set aside 1 tablespoon for step 10) and return the rest to the pot. *you can also use an immersion blender for less dishes*
Add the cream cheese to the pot and stir until melted. Once melted, add sour cream, chicken broth, and heavy cream. Whisk until combined, then cook for 5 minutes, or until bubbling.
Next, stir in ½ of the crumbled Bleu cheese. Cook for 5 minutes, or until melted.
Add shredded chicken to a mixing bowl and toss with pepper, ranch seasoning, and cayenne pepper. Add chicken and pasta to the sauce.
Chop the celery and add to the pot. *Do not cook the celery, the crunch makes all the difference!*
Stir until thoroughly mixed.
Garnish with Bleu cheese and green onions if desired. Drizzle with reserved buffalo sauce and enjoy