It’s not 20 gram per serving, it’s 18, but the Vital Proteins Collagen is legitimately the most dissolvable, taste free protein I’ve ever used. Coffee, tea, soup, smoothies, yogurt, no change in taste, texture, or anything.
My favorite is Isopure zero carb dutch chocolate flavor, you can buy it on Amazon or at GNC. It’s whey protein though, so if you’re looking for something dairy free it wouldn’t be appropriate (it is lactose free though).