1. Preheat your waffle iron: Plug in your waffle iron and allow it to fully preheat according to the manufacturer’s instructions. Most waffle irons have an indicator light that signals when it’s ready. Lightly grease the plates with cooking spray or a brush of oil, even if it’s non-stick, to ensure easy release.

2. Combine wet ingredients: In a large mixing bowl, whisk together the sourdough discard, egg, milk, and melted butter until well combined and smooth. Ensure there are no large lumps of discard.

3. Mix dry ingredients: In a separate medium bowl, whisk together the all-purpose flour, baking powder, baking soda, salt, and black pepper. Make sure these dry ingredients are thoroughly combined to ensure even leavening.

4. Combine wet and dry mixtures: Pour the dry ingredients into the wet ingredients. Stir gently with a spatula or whisk until just combined. It’s okay if there are a few small lumps; overmixing can lead to tough waffles. If using, fold in the shredded cheese or other savory mix-ins at this stage.

5. Cook the waffles: Ladle about 1/2 to 3/4 cup of batter (or the amount recommended by your waffle iron manufacturer) onto the hot, greased waffle iron. Close the lid and cook for 3-5 minutes, or until the waffle is golden brown and crisp, and steam is no longer escaping from the sides of the iron. The exact cooking time will depend on your waffle iron and desired crispness.

6. Remove and serve: Carefully remove the cooked waffle from the iron using a fork or tongs. Place it on a wire rack to prevent it from getting soggy while you cook the remaining batter. Serve immediately with your favorite savory toppings.