I was making those brownies I just posted, and realized I had no sweetened condensed milk. Whoops! I found this recipe on the net. I think next time I will up the water. It was way too thick.
In your blender, add 1/2 cup boiling water, 1 cup dry milk, 1 cup sugar and 1 T butter (not margarine). Blend until well mixed and creamy looking.