If you love waffles that are genuinely shatteringly crisp on the outside while staying light and airy in the middle, these crispy sourdough discard waffles are unmatched. Unlike heavy, dense waffles made with standard baking mixes, the natural acidity and fermented starches in sourdough discard create a delicate, steam-filled batter that crisps to golden perfection in the waffle iron.
Whether you mix the batter fresh in the morning or let it ferment overnight in the refrigerator for an extra tangy weekend brunch, this recipe delivers bakery-style waffles every single time.
Why Discard Makes the Crispiest Waffles
Waffle crispness comes down to two scientific factors: low gluten development and rapid steam expansion:
- Steam-Powered Pockets: Sourdough discard is naturally acidic. When it hits the baking soda in the hot iron, it creates immediate micro-bubbles that puff up the interior while letting moisture escape, preventing sogginess.
- Melted Butter Emulsion: Combining melted butter with room-temperature discard and eggs creates a protective fat barrier that crisps instantly against the hot iron plates.
- Overnight Fermentation Option: For the deepest flavor, you can mix the flour, milk, and discard the night before. By morning, wild yeasts have relaxed the gluten, giving you even lighter waffles (pair them with our fluffy sourdough discard pancakes for a complete brunch spread).
Ingredients (Grams & Cups)
- Sourdough Discard (240g / 1 cup): 100% hydration discard, cold or room temperature. Unsure of shelf life? Check how long sourdough discard lasts.
- All-Purpose Flour (120g / 1 cup): Keeps the structure light.
- Buttermilk or Whole Milk (240g / 1 cup): Buttermilk adds tenderness and extra tang.
- Unsalted Butter (60g / 1/4 cup, melted): Essential for crispy edges.
- Granulated Sugar (25g / 2 tbsp): Encourages golden-brown caramelization.
- Large Eggs (2 separated): Whisking the egg whites to soft peaks before folding them in is the secret to cloud-like waffle interiors!
- Baking Powder (1 tsp) & Baking Soda (1/2 tsp): Reacts with the discard for explosive rise.
- Fine Sea Salt (1/2 tsp) & Vanilla Extract (1 tsp).
Step-by-Step Instructions
- Whisk Wet Ingredients: In a medium bowl, whisk together the sourdough discard, milk, melted butter, egg yolks, sugar, and vanilla extract until smooth.
- Add Dry: In a separate bowl, whisk flour, baking powder, baking soda, and salt. Stir the dry ingredients into the wet mixture until just combined.
- Whip Egg Whites (Pro Tip): In a clean bowl, beat the 2 egg whites with a handheld whisk until soft peaks form. Gently fold the whipped whites into the batter with a rubber spatula. This guarantees an airy, featherlight crumb.
- Bake in Hot Iron: Preheat your waffle iron to high heat. Lightly brush with butter or oil. Pour roughly 1/2 cup of batter per waffle and cook until deep golden and steam stops escaping (approx. 4–5 minutes).
- Keep Crispy: Place finished waffles on a wire cooling rack in a 200°F (95°C) oven while baking the rest. Never stack hot waffles directly on top of each other on a plate—steam will make them soft!
🥖 Free Sourdough Troubleshooting Guide
Struggling with a sluggish starter, flat loaf, or gummy crumb? Get our step-by-step baker’s diagnostic cheat sheet sent directly to your inbox.
Crispy Sourdough Discard Waffles
Golden-crisp Belgian-style waffles made with sourdough starter discard, melted butter, and whipped egg whites.
Ingredients:
- 240g sourdough starter discard (1 cup)
- 120g all-purpose flour (1 cup)
- 240g buttermilk or milk (1 cup)
- 60g unsalted butter, melted (1/4 cup)
- 25g granulated sugar (2 tbsp)
- 2 large eggs, separated
- 1 tsp baking powder
- 1/2 tsp baking soda
- 1/2 tsp fine sea salt
- 1 tsp pure vanilla extract
Instructions:
- Whisk discard, buttermilk, melted butter, egg yolks, sugar, and vanilla in a bowl.
- Combine flour, baking powder, baking soda, and salt; stir into the wet batter until just mixed.
- Whip egg whites to soft peaks and gently fold into the batter.
- Ladle batter onto a preheated, greased waffle iron. Bake until deep golden-brown and crisp.
- Serve hot with maple syrup and fresh fruit, or keep warm on an oven rack at 200°F.
More Sourdough Discard Breakfast Favorites
Round out your morning baking rotation with our ultra-moist sourdough discard banana bread, our baker-style sourdough discard muffins, and our quick 1-hour sourdough discard cinnamon rolls.