Air Fryer Sourdough Discard Miso Butter and Corn Kernel Flatbread Shards
Thin, crispy flatbread shards infused with white miso butter and studded with corn kernels. Made from sourdough discard and air-fried until golden and shatteringly crunchy, these savory-umami snacks are perfect for using up starter while creating an addictive nibble. The combination of miso's salty depth, butter's richness, and sweet corn kernels creates a complex flavor profile in every bite.
- Prep
- 15 min
- Cook
- 12 min
- Total
- 27 min
- Makes
- About 24 shards (enough for 4 servings as a snack)
Steps
Before you start
- Ensure your sourdough discard is at room temperature (not fresh from the fridge)
- Pat corn kernels dry with a paper towel to prevent steaming and promote crispness
- Bring air fryer to temperature before cooking for even browning
Mix miso butter
- In a small bowl, combine softened butter and white miso paste.
- Stir vigorously with a spatula for 1–2 minutes until completely homogenized and no streaks remain.
- The mixture should be smooth and pale beige.
- Taste and adjust seasoning if desired.
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Ready when: No streaks of white or dark miso visible; color is uniform
Tip: If the butter is too cold, it will be grainy and hard to mix. Room temperature is essential.
Combine dough and toppings
- Add the room-temperature sourdough discard to a bowl.
- Fold in the miso butter until fully incorporated (the dough will be loose and batter-like).
- Gently fold in the corn kernels, sea salt, and black pepper.
- Do not overmix; the corn should be evenly distributed but not crushed.
- Sprinkle sesame seeds on top if using.
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Ready when: Corn kernels are evenly scattered throughout; miso butter is fully combined
Tip: Sourdough discard is wet—this is correct. You're making a thick batter, not a dough.
Spread on parchmentOven 380°F / 195°C
- Preheat air fryer to 380°F (193°C).
- Cut parchment paper to fit the bottom of your air fryer basket.
- Pour the corn-miso batter onto the parchment and spread it into an even ¼-inch (6 mm) layer using the back of a spatula.
- Try to achieve uniform thickness so it bakes evenly.
- The rectangle should roughly fit your basket, about 7 × 9 inches (18 × 23 cm).
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Ready when: Batter is spread uniformly in a thin, even sheet
Tip: Thinner is crispier. If it's too thick, the center won't crisp up before the edges burn.
Air-fry until edges brownOven 380°F / 195°C
- Carefully transfer the parchment sheet (with batter) to the preheated air fryer basket.
- Air-fry at 380°F (193°C) for 8–10 minutes.
- Start checking at 8 minutes—the edges should be deep golden brown and the top should look set and slightly shiny.
- The center may still feel a touch soft, but residual heat will crisp it further as it cools.
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Ready when: Edges are deep golden brown, top is firm and glossy, and edges pull away slightly from parchment
Tip: If your air fryer runs hot, start checking at 7 minutes. Burnt edges = bitter taste, so watch carefully in the final 2 minutes.
Cool and break into shards
- Remove the parchment sheet from the air fryer and let the flatbread cool on the parchment for 5–10 minutes at room temperature.
- As it cools, it will become increasingly crispy.
- Once completely cooled, break or cut it into irregular shards roughly 2–3 inches (5–8 cm) wide.
- Larger, uneven pieces have better texture than small crumbles.
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Ready when: Flatbread is completely cold and snaps easily when bent; it should shatter, not bend
Tip: Breaking while still slightly warm will give cleaner shards. Once fully cooled, it becomes more brittle and may crumble.
Good to know
Tips
- Sourdough discard should be unfed and active—fresh from a recent feeding—for the best rise and flavor. Refrigerated discard will be denser and less flavorful.
- If your corn kernels are frozen, thaw and pat them very dry. Excess moisture will steam rather than crisp, making the flatbread chewy.
- For extra umami depth, sprinkle a tiny pinch of nori (seaweed) powder or fish-free furikake seasoning on top before air-frying.
- These shards are best eaten the day they're made, while they're still maximally crispy. After 24 hours, they'll soften slightly but remain pleasant; reheat briefly in the oven to restore crispness.
Make ahead
You can prepare the miso butter up to 3 days ahead and store it covered in the refrigerator. Bring to room temperature before mixing with the sourdough discard. The finished flatbread shards keep for up to 5 days in an airtight container at room temperature.
Storage & reheating
Room temperature (airtight container, up to 5 days): The shards will stay crispy if kept away from moisture. Do not refrigerate, as condensation will soften them. Freezer (freezer bag, up to 1 month): Thaw at room temperature in a closed container, or reheat shards in a 300°F (149°C) oven for 3–4 minutes to restore crispness.
Substitutions
- white miso paste → red miso paste (or 2 tsp soy sauce + ½ tsp white miso). Red miso will add a deeper, slightly spicy flavor and a darker color. Reduce to 1 tbsp (18g) as it's more potent. Alternatively, mix soy sauce and a small amount of white miso for a lighter umami note.
- fresh or frozen corn kernels → edamame, finely chopped mushrooms, or crispy bacon bits. Edamame adds protein and earthiness; mushrooms (sautéed and dried) deepen umami; bacon complements the miso beautifully. Use the same amount.
- unsalted butter → neutral oil (grapeseed, vegetable, or light olive oil). Oil will make the flatbread slightly less rich but still crispy. Use the same amount (3 tbsp / 45 ml). The miso will blend more easily into oil.
- fine sea salt → fleur de sel or Maldon sea salt. Use the same amount for finishing salt, or sprinkle a pinch of fleur de sel on the flatbread after air-frying for a briny, mineral finish.
