A non-stick frying pan is the MVP when it comes to pancakes. If you don’t have a non-stick pan, you will need to use more oil or butter to stop it from sticking.
If you do want to add protein powder, you can substitute some of the flour for protein powder. White chocolate or vanilla flavour would work nicely, but bear in mind this will make them extra sweet and also makes them slightly spongier in texture. Swapping the egg whites for eggs works, but note that this will lower the protein and increase the fat content of the dish.