Measure the ingredients in the order listed into your blender jar: cottage cheese, eggs, sugar (if using), vanilla extract, water or milk, baking powder, and salt. Blend for 30 seconds to 1 minute to incorporate all the ingredients.
Pour the liquid into the bowl with the flour, mixing the flour with the liquid using a rubber spatula. I incorporate the batter, working the flour from the outside of the bowl until everything is just combined.
Cook:
Heat the waffle maker and grease it with oil if needed. Once hot, pour enough waffle batter to fill the space most of the way -the batter will expand. Close the waffle maker and cook the waffle until the color is golden brown and lifts easily. Remove each waffle from the waffle maker and repeat the process with the remaining batter.
Serve:
Serve these waffles with your favorite toppings and syrups.