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).
Grease a skillet with butter or cooking spray and heat over medium-low heat*. Pour approximately ⅓ cup of batter into the center of the pan. Cook for 2-3 minutes until the pancake is bubbling, the edges are starting to set, and the bottom is lightly browned. Carefully flip the pancake and cook an additional 2-3 minutes until lightly browned on both sides. Transfer to a plate and serve (or cooling rack, for cooling).
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Notes
*Temperatures may vary based on your stovetop. I recommend cooking pancakes over either medium or medium-low heat. 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 and these Sourdough Protein Waffles, too!