In a large bowl, whisk eggs until beaten. Add milk, vegetable oil, and orange zest, and whisk to combine. Add sourdough discard and whisk until fully incorporated and smooth.
In a separate large bowl, whisk together flour, sugar, baking powder, salt, and nutmeg. Pour the wet ingredients into the dry ingredients and whisk to combine. Mix until combined and no dry streaks remain. If adding any mix-ins (such as chocolate chips or blueberries), fold those in at this point.
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 and crispy. Serve immediately with your favorite toppings.
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Notes
This recipe makes approximately 12 waffles (2 waffles per serving). To make this recipe with active sourdough starter, replace the sourdough discard with active starter (200g). You do not need to change any other ingredients.