In a medium bowl, whisk eggs until beaten. Add milk and whisk to combine. Add sugars, cottage cheese, sourdough discard, and vanilla extract, and whisk until fully incorporated. Pour in the melted butter and stir until combined.
In a separate large bowl, whisk together flour, baking powder, and salt. Pour the wet ingredients into the dry ingredients. Stir until no dry spots remain (the batter will be lumpy from the cottage cheese).
Heat your waffle iron and brush with butter or spray with cooking spray. Pour batter (about ⅓ cup per waffle) on the iron and cook the waffles until golden brown. Serve immediately with your favorite toppings.
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Notes
To make this recipe with active sourdough starter, replace the sourdough discard with active starter (200g). You do not need to make any other changes to the recipe. Looking for other protein-packed recipes? Try these Sourdough Discard Protein Bagels, too!