Place sliced, frozen chicken in the bottom of a crockpot. Cut butter and cream cheese into pieces, and add them, along with the cream of chicken soup and Italian seasoning mix, to the crock pot. Cook on low for 8 hours, or high for 6 hours, stirring periodically to mix sauce together.
When ready to serve, boil pasta until it's cooked to your liking. Drain (don't rinse) and toss the pasta and chicken/sauce mixture together.
Note** you can also use full chicken breasts. Just shred the chicken after cooking time, add it back into sauce, then mix with the cooked pasta.