01 - Arrange chicken breasts in the bottom of a 5 or 6-quart slow cooker.
02 - Pour in chicken broth and buffalo wing sauce. Sprinkle garlic powder, onion powder, smoked paprika, black pepper, and salt over the chicken. Mix gently to combine.
03 - Cover and cook on high for 2 hours, or until the chicken is thoroughly cooked and tender.
04 - Remove chicken from the slow cooker. Shred with two forks until finely pulled, then return the meat to the cooker.
05 - Add cubed cream cheese, shredded cheddar, mozzarella, heavy cream, sour cream, and unsalted butter. Stir until the cheeses start to melt and mixture becomes cohesive.
06 - Stir in uncooked elbow macaroni, ensuring all ingredients are well blended.
07 - Cover and continue cooking on high for 30 to 40 minutes, stirring every 10 minutes, until pasta is al dente and sauce is thick and creamy.
08 - Taste and adjust salt if necessary. Serve hot, garnished with chopped green onions, extra buffalo sauce, and blue cheese crumbles as desired.