01 - Arrange chicken breasts in an even layer at the bottom of the slow cooker insert.
02 - 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 in a medium bowl until completely smooth and well combined.
03 - Pour the prepared sauce mixture evenly over the chicken breasts.
04 - Cover 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.
05 - Twenty minutes before serving, bring a large pot of salted water to boil. Cook pasta according to package directions until al dente, then drain thoroughly in a colander.
06 - Transfer cooked chicken breasts to a cutting board and shred using two forks. Return shredded chicken to the slow cooker and stir into the sauce.
07 - Add drained pasta to the slow cooker and fold gently until evenly coated with the creamy garlic parmesan sauce.
08 - Portion pasta into bowls and sprinkle with chopped fresh parsley before serving hot.