In a bowl, mix together protein powder, oat flour, baking powder, and salt.
Add eggs, milk, and vanilla extract to the bowl, then whisk to make a batter.
Preheat the waffle maker and lightly coat with oil.
Pour an appropriate amount of batter into the waffle maker.
Cook for 3-4 minutes until the waffles are golden brown.
Remove the finished waffle and add toppings of your choice.