01 - Place chicken breasts in the bottom of the crock pot. Season evenly with salt, pepper, and Italian herbs.
02 - Distribute chopped onion and minced garlic over the seasoned chicken.
03 - Pour chicken broth and heavy cream into the crock pot. Dot surface with cream cheese cubes and butter.
04 - Cover and cook on low setting for 4 hours until chicken is fully cooked through and tender.
05 - Remove chicken breasts and shred using two forks. Return shredded meat to the slow cooker.
06 - Stir in uncooked fettuccine, submerging pasta as much as possible in the liquid.
07 - Sprinkle Parmesan cheese over mixture and stir to combine. Cover and cook on high for 25-35 minutes, stirring once or twice, until pasta is al dente and sauce reaches desired creaminess.
08 - Serve immediately, garnished with fresh chopped parsley.