In a large mixing bowl, whisk together the protein powder, flour, baking powder, and salt until fully combined.

In a separate bowl, combine the water, egg whites, yogurt or applesauce, and sweetener. Stir well until smooth.

Gradually pour the wet mixture into the dry ingredients, stirring gently until a smooth batter forms.

Preheat your waffle iron according to the manufacturer’s instructions and grease it with nonstick spray.

Once preheated, pour enough batter into the center of the waffle iron to fill it without overflowing. Cook for 4-5 minutes until golden brown.

Carefully remove the waffles from the iron and serve them hot with your choice of toppings.