01 - Arrange chicken breasts in a single layer at the bottom of a 6-quart slow cooker. Sprinkle ranch seasoning evenly over the chicken, then place cream cheese cubes on top. Pour chicken broth around the chicken.
02 - Cover and cook on LOW for 4 hours (or HIGH for 2 hours) until chicken is tender and reaches an internal temperature of 165°F.
03 - Remove chicken from slow cooker and shred using two forks. Return shredded chicken to the slow cooker. Stir in sour cream, cooked bacon (reserving some for topping), and 1½ cups cheddar cheese until well combined.
04 - While chicken finishes cooking, bring a large pot of salted water to boil. Cook pasta for 1-2 minutes less than package directions for al dente texture. Drain well.
05 - Add cooked pasta and frozen peas (if using) to the slow cooker. Stir thoroughly to distribute all ingredients evenly.
06 - Sprinkle remaining cheddar cheese and reserved bacon over the top. Cover and cook for an additional 10 minutes until cheese is fully melted and bubbly.
07 - Garnish with thinly sliced green onions just before serving. Serve hot while cheese is melted and pasta is tender.