It's turning clumpy because of the temp of the coffee. Protein powder will clump up if its hotter than 130 degrees. It's kind of an exact science....it took me awhile, but I have it down pat now. I do half a scoop of vanila protein powder and 1 tablespoon of the Coffeemate sugar free french vanilla, mix those two together until it turns into a paste. Then I add my coffee (about a 1/4 of a cup, stir really well (you have to also get your spoon and push and crush the powder on the side of your cup to mix it up well....then I add remining coffee, stir again. Sometimes you may have a little protein poweder floating on top, but just sifen that off with your spoon. AFter a few tries, you will get it....but it's one easy way for me to get 11-12 grams of protein (and 12 oz of liquid) with my cup of joe first thing in the morning! Just remember, don't put your coffee in there piping hot or it will clump up to no end! You can microwave the coffee again after you have it mixed well (for some reason, once it's mixed in like I suggested above, it won't clump anymore).
Lost 12 pounds during pre-op diet