i would mix my Protein powder like you would for cornstarch. use warm Water to liquify the protein then add to the broth. that way it does not clump. I used my protein in everything. broth, juice or milk. with milk is my favorite. i mix protein with ff milk, two sweet n lows and a dash of vanilla. not think and takes care of my sweet tooth at the same time.
Good luck. finding a good Protein Powder you like is hard. Good luck on your search!