Protein banana bread

The banana cake recipe i usually follow is:

4 bananas
250g self raising flour
2 teaspoons baking powder
100g butter
200g caster sugar
2 eggs

I would like to add some whey protein to it, can i just add whey to the mix or should i take out some of the flour and substitute for whey powder?

cheers

from Bodybuilding.com Forums - Nutrition https://bbcom.me/2YsBFp1