01 - Arrange chicken breasts in an even layer at the bottom of the slow cooker insert.
02 - In a medium bowl, whisk together the softened cream cheese, Parmesan cheese, heavy cream, minced garlic, Italian seasoning, salt, black pepper, red pepper flakes, condensed cream of chicken soup, and chicken broth until thoroughly combined and smooth.
03 - Pour the sauce mixture evenly over the chicken breasts. Cover and cook on high setting for 4 hours or low setting for 6 hours, until chicken reaches 165°F and is tender enough to shred easily.
04 - Approximately 20 minutes before serving, cook pasta in a large pot of salted boiling water according to package directions until al dente. Drain thoroughly in a colander.
05 - Remove cooked chicken breasts from the slow cooker using tongs. Shred the meat using two forks, then return the shredded chicken to the sauce and stir to distribute evenly.
06 - Add the drained pasta to the slow cooker and fold gently until fully coated in the creamy garlic Parmesan sauce. Serve immediately, sprinkled with fresh chopped parsley.