Add all ingredients except heavy cream and arrowroot powder into slow cooker.
Cook on low for 6-7 hours or high for 3-4 hours.
When cooking is nearing the end mix the heavy cream and arrowroot powder in a small bowl.
Gradually add the arrowroot and milk mixture to the slow cooker.
Stirring thoroughly.
Mixture will thicken to a chowder consistency within approximately 5 minutes.