Pour one can of sweetened condensed milk into a shallow casserole dish or pie plate.
Cover tightly with aluminum foil.
Place in a larger pan and create a water bath up 50-75% of the dish with the sweetened condensed milk. It really depends on the size of your pans as to how much it can handle. Don't overfill, but don't let it get dry either.
Bake 60-90 minutes or until condensed milk has reached a golden brown color. Check it periodically and also replace water as needed.
Remove thin crust from the top or use an immersion blender to melt it back in.
Cool completely and transfer to an airtight container or glass jar.
Cover and refrigerate for up to 1 month.
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