In a large bowl, whisk together the flour, baking powder, salt, cheese, and pepper.
In a separate bowl, combine the milk, egg whites, and melted butter. Pour the mixture over the dry ingredients and stir to combine into a batter.
Preheat the waffle iron. Brush a little canola oil on both sides of the waffle iron and cook the waffles according to the manufacturer’s instructions. Cook the waffles until they are a light golden. Do not let the waffles brown too much as the cheese will burn.