01 - Arrange chicken breasts in an even layer at the bottom of the slow cooker insert.
02 - In a medium bowl, whisk together softened cream cheese, Parmesan cheese, heavy cream, minced garlic, Italian seasoning, salt, black pepper, red pepper flakes, cream of chicken soup, and chicken broth until completely smooth and well combined.
03 - Pour the sauce mixture evenly over the chicken breasts. Cover with lid and cook on high setting for 4 hours or low setting for 6 hours, until chicken reaches internal temperature of 165°F and is tender enough to shred easily.
04 - Approximately 20 minutes before the chicken finishes cooking, bring a large pot of salted water to boil. Cook pasta according to package directions until al dente, then drain thoroughly in a colander.
05 - Transfer cooked chicken breasts from the slow cooker to a clean cutting board. Using two forks, shred the chicken into bite-sized pieces. Return shredded chicken to the slow cooker and stir thoroughly to incorporate with the sauce.
06 - Add drained pasta to the slow cooker, folding gently to coat evenly with the creamy garlic Parmesan sauce. Serve immediately, topped generously with fresh chopped parsley.