Place all the ingredients listed above, except for the corn starch, milk, and chives, into a Gallon Freezer Bag, remove all air, seal, label and freeze flat.
When ready to cook, remove from freezer day before and allow to defrost in the fridge.
4 hours before dinner; place all ingredients from the bag into the slow cooker. Set to high. Cover, and walk away.
Check the chicken around 2-3 hours after cooking. If chicken is cooked through continue to step 5.
Whisk the milk and corn starch together, and slowly stir into the slow cooker. Cover, let cook another 30 minutes, or until Chicken Ala King is thick and creamy and ready to serve. Note: ONLY add this cornstarch mixture 30 minutes before you are ready to eat it, if you leave the cornstarch in for over 30 minutes it may separate and make for less smooth looking gravy.
Top with fresh parsley or chives, serve over starch of choice. Enjoy!