Season the breast to taste with salt and pepper.
Place in crock pot. Pour butter over the top.
Cook on low for 8 hours.
When done, remove turkey to a platter to cool. When cool enough, remove meat from the bone and shred.
Pour juices from crock pot into a sauce pan. Bring to a boil. Add a little chicken broth if needed or if more gravy is desired.
In a small bowl, stir 2 tbsp corn starch and 2 tbsp water together. Stir into juices.
Heat and stir until thick.
Return meat to crock pot and stir in the gravy. If necessary, heat on high until heated through.
Serve with noodles, mashed potatoes or rice.