01 - Arrange chicken breasts in a single layer in a 6-quart slow cooker. Sprinkle ranch seasoning evenly over the chicken, then top with cream cheese cubes.
02 - Pour chicken broth around the chicken. Cover and cook on LOW for 4 hours (or HIGH for 2 hours), until the chicken is tender and easy to shred.
03 - Remove the chicken, shred with two forks, and return to the slow cooker. Stir in sour cream, cooked bacon (reserve some for topping), and 1.5 cups cheddar cheese.
04 - Meanwhile, cook pasta in a pot of salted boiling water for 1-2 minutes less than package directions. Drain well.
05 - Add cooked pasta and peas (if using) to the slow cooker. Stir to combine. Sprinkle the remaining cheddar cheese and reserved bacon on top. Cover and heat for an additional 10 minutes, until cheese is melted.
06 - Garnish with sliced green onions before serving.