Recipes for Boosting Protein Powder with Beans?

I am using Sprout's brand Whey protein in vanilla and have no problem with the taste, but I do wish it had more protein in it. Its the only one I have found that is affordable, uses no artificial sugars/stevia/agave, is low carb (2 gms) and tastes good. But with 18 gms of protein, I do wish it had more protein. Some beans are pretty mild flavor, so I wondered if anyone has ever tried adding them to their shake. Any suggestions on specific kinds of beans with little flavor? Pretty soon my teeth are all going to be pulled out in preparation for dentures and I am going to have to live on my protein shakes for a bit. I think it would be helpful for them to have more protein.