Open cans of sweetened condensed milk and pour into three half pint jars, dividing evenly. Put on lids and rings.
Place jars into a crock pot.
Fill crock pot with water so that it covers the top of the jars.
Turn crock pot onto low and set timer for 10 hours.
After 10 hours and remove jars from crock pot.
Open the lid and grab a spoon!