01 - Place chicken breasts in a single layer at the bottom of a 6-quart slow cooker.
02 - Sprinkle ranch seasoning mix evenly over the chicken, then arrange cream cheese cubes on top.
03 - Pour chicken broth around the chicken. Cover and cook on LOW for 4 hours or HIGH for 2 hours, until chicken is tender and easily shreds.
04 - Remove chicken from slow cooker and shred using two forks. Return shredded chicken to the slow cooker and stir in sour cream, cooked bacon (reserve some for topping), and 1.5 cups cheddar cheese.
05 - While chicken finishes cooking, bring a large pot of salted water to boil. Cook pasta for 1-2 minutes less than package directions, then drain well.
06 - Add cooked pasta and frozen peas (if using) to the slow cooker. Stir thoroughly to combine all ingredients.
07 - Sprinkle remaining cheddar cheese and reserved bacon over the top. Cover and cook for an additional 10 minutes until cheese is fully melted.
08 - Top with sliced green onions just before serving.