This was a Heloise Hint cut from newspaper many years ago.

1 cup powdered milk
1/3 cup boiling water
2/3 cup sugar
3 tablespoons butter

Put all ingredients in a blender and blend until all of the sugar is dissolved. If the mixture is too thick for your purposes, you can add a few drops of water and blend. This recipe is equal to approximately one can of sweetened condensed milk.