Pour can of condensed milk into a medium size microwaveable bowl, then cover tightly with saran wrap. Set microwave to low setting, I set mine on #4, then microwave for 3-5 minutes, remove saran wrap, stir, and cover tightly again with a new piece of wrap.(This prevents moisture from forming on the inside of the bowl. Return to oven on low for another 3 -5 minutes. Remove wrap, and stir, if need be ,add a third wrap of saran and continue to cook over low another 3 minutes or so until milk mixture becomes thick and caramel color, a total of 9 to 15 minutes. Mine took 9 minutes. Remove from microwave.