Spray the slow cooker crock with non-stick spray or lightly oil the inside.

Combine all ingredients in a mixing bowl. Using an electric hand-held mixer at low to medium speed, beat ingredients together until smooth.

Pour the mixture into the prepared crockpot.

Cover and cook on Low 6 to 8 hours, or cook on High 3 to 4 hours.

Spoon into cups and top with whipped topping or a lightly spiced whipped cream.