1Crumble breads, add all other ingredients except butter. (You may want to cook the celery and onions to just tender before adding to other ingredients, My mom pops them into the microwave for a minute or two.)
2Spray crockpot with cooking spray. Pour mixture into crockpot and cover.
3Cook on high for 2 hours or on low for 3 to 4 hours.
4Stir in cooked chicken about an hour before dressing is finished cooking.