Sure, stir it in!! Gotta hide the taste of that unflavored stuff anyway you can!
I hid it in applesauce, broth, SF pudding (from a mix), NSA Carnation Instant Breakfasts - anything I could think of to kick the protein up a bit! Be creative!! If you find something that doesn't work, the worst that'll happen is that it'll taste nasty. It won't kill you.
CT