Place all of the ingredients in a food processor or blender. Put on high speed till contents is well mixed and a light powdery texture.
Note: I use the rice milk powder over the soy milk powder because the rice milk powder already has a light silky texture. The rice milk powder also has a lighter flavor so it doesn't compete with the other flavors that you are trying to achieve.
Variations: Use the different flavored soy or rice milk powders. I was very pleased with the rice milk vanilla powder. Use the different flavored milk powders to make drizzles.