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, 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 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 shreds easily.
05 - About 20 minutes before serving, bring a large pot of salted water to boil. Cook pasta according to package directions until al dente, then drain thoroughly.
06 - Transfer cooked chicken breasts to a cutting board or plate. Using two forks, shred meat into bite-sized pieces. Return shredded chicken to the slow cooker and stir into the sauce.
07 - Add drained pasta to the slow cooker, folding gently until evenly coated with the creamy garlic sauce. Serve immediately, topped with chopped fresh parsley.