Place the chicken, butter, soups, broth, seasoning and onion in a slow cooker, and fill with enough water to cover.
Cover, and cook for 5 to 6 hours on High. About 30 minutes before serving, remove the chicken breasts and shred on a plate. Return to the slow cooker.
Whisk all of your dry ingredients together.Cut in the butter until it's small pea sized bits in the dry mixture.Add your milk and mix well.Drop by large, golf ball sized tablespoonful onto the top of your stew/soup concoction in the crockpot.Seal the crockpot with tinfoil and the lid. Steam them for about 30 - 40 minutes.