Open the sweetened condensed milk and pour it a canning jar, tightening the lid as tight as you can.

Put the jar into your slow cooker base and fill with water until the jar is completely submerged.

Let sit on high for 4-6 hours, depending on how you like the consistency of your dulce de leche to be. (I like mine more runny, so I found 5 hours to be the perfect amount of time.)

Remove from the crockpot and shamelessly eat it right out of the jar.