I have only used the liquid, I usually replace 1/2 to 3/4 the water with the liquid creamer, it depends on how strong I want the flavor(1/2 more subtle). I have read here that if you use the dry 2 tablespoons per cake mix is the perfect amount. I think it depends on the availability of flavors and how quickly you will use it! It really has added many new flavors to my recipe book!
Best of luck,
Tracy
Recipes using both liquid and powdered non-dairy creamers:
http://forum.cakecentral.com/cake-decorating-ftopict-159851-.html
Adding creamer to WASC cake:
http://forum.cakecentral.com/cake-decorating-ftopict-270263-.html
HTH
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