From my favorite cookbook, Esther Shank's Mennonite Country-Style Recipes. I've tweaked it just a bit. This recipe predates worries about raw eggs, so you might want to use an egg substitute.
Add milk a little at a time to powdered milk, stirring or whisking until smooth. Then add remaining ingredients and stir or whisk.
OR combine all ingredients in a blender and process until frothy.
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