I’ll put protein in goddamn near anything.
Coffee
Cereal
Oatmeal
Granola
Hot chocolate
Yogurt
Water
Milk
Juice
Peanut butter
Yeah…
Oh to answer the question, I use a flavorless colorless whey protein powder that my Mom sells at her office, therefore I get it for free. It’s made by Standard Process.
However, Optimum Nutrition is usually very tasty 
_Mel