As a reminder, you need a whey/casein blend protein for the “fluffing” action in the food processor to occur. It will not work with vegan protein. That’s why I always use PE Science protein.
I am not affiliated with PE Science protein (yet, but it’s totally my dream to one day be!) I just use their product because it’s the best protein for fluff & baking I’ve found!
If you choose to use only whey protein, you will need to use 1-2g of xanthan gum to help it fluff. Some people complain that xanthan gum causes bloating, so be warned.