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 thoroughly combined and smooth.
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 is tender and reaches an internal temperature of 165°F.
05 - About 20 minutes before serving, bring a large pot of salted water to boil. Cook pasta according to package directions until al dente. Drain well in a colander.
06 - Transfer cooked chicken breasts from the slow cooker to a cutting board. Using two forks, shred the meat into bite-sized pieces. Return shredded chicken to the sauce and stir to incorporate.
07 - Add the drained, cooked pasta to the slow cooker. Gently fold until pasta is evenly coated with the creamy garlic Parmesan sauce.
08 - Portion the chicken and pasta into bowls. Sprinkle with freshly chopped parsley just before serving.