In a large bowl, mash bananas. Mix remaining ingredients for pancakes together until just combined. Heat butter in a large frying pan over medium heat.
Add a small spoonful of pancake mixture to test, making sure skillet is hot enough to add pancake batter. Once bottom of tester pancake starts to form, flip and then remove from heat.
Add pancake batter by large ladle scoop, cooking four pancakes at a time and flipping once a bottom starts to form, about 5 minutes.
Freeze pancakes up to 2 months, reheating in microwave on high for 1 1/2 to 2 minutes or reheating in the toaster. Top with optional toppings and serve!
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Notes
IMPORTANT NOTE: You must use whey protein with this recipe. It will NOT work with any other kind, especially plant-based, because the mixture will be too thick.