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 easily shreds with a fork.
03 - Remove the chicken from the slow cooker and shred using two forks. Return the shredded chicken to the slow cooker. Stir in sour cream, cooked bacon (reserving some for topping), and 1½ cups of cheddar cheese until well combined.
04 - While the chicken finishes cooking, bring a large pot of salted water to a boil. Add pasta and cook for 1-2 minutes less than package directions for al dente texture. Drain well.
05 - Add the cooked pasta and frozen peas (if using) to the slow cooker. Stir thoroughly to coat all ingredients with the creamy sauce mixture.
06 - Sprinkle the remaining cheddar cheese and reserved bacon over the top. Cover and cook for an additional 10 minutes until the cheese is fully melted and bubbly.
07 - Remove the slow cooker insert carefully. Garnish with thinly sliced green onions just before serving. Serve hot while the cheese is still melted and creamy.