Sourdough Discard Banana Bread with Walnuts

By AislePrompt Test Kitchen · Reviewed by AislePrompt Editorial · ·

A moist, flavorful banana bread made with sourdough starter discard and toasted walnuts, perfect for using up ripe bananas and starter. This american-inspired breakfast (gluten-free) ready in about 75 minutes pairs sourdough discard, large bananas, all-purpose flour for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 220 calories and feeds 10, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart.

★ 4.2 (13 ratings) Prep: 15 min Cook: 60 min Serves 10 American cuisine 220 cal/serving
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Ingredients

Instructions

  1. Step 1: Preheat oven to 350°F and grease a 9x5-inch loaf pan. Mash bananas in a large bowl until smooth, then mix in melted butter and brown sugar until well combined.
  2. Step 2: Whisk sourdough discard, flour, baking soda, and salt together in a separate bowl. Gradually add to banana mixture, mixing until just combined.
  3. Step 3: Fold in vanilla extract and chopped walnuts until evenly distributed throughout the batter.
  4. Step 4: Pour batter into prepared loaf pan and smooth the top. Bake for 55-60 minutes until a toothpick inserted into the center comes out clean.
  5. Step 5: Let cool in pan for 15 minutes before transferring to a wire rack to cool completely.

Frequently asked questions

How long does Sourdough Discard Banana Bread with Walnuts take to make?

Total time is about 75 minutes (15 min prep + 60 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.

How do I store leftover Sourdough Discard Banana Bread with Walnuts?

Cool to room temperature within 2 hours, then store in an airtight container in the fridge for up to 4 days. Reheat covered in a 350°F oven for 10-12 minutes, or microwave at 70% power in 60-second bursts to keep sourdough discard from drying out.

Can I substitute ingredients in Sourdough Discard Banana Bread with Walnuts?

Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.

How do I scale Sourdough Discard Banana Bread with Walnuts for a different number of people?

The recipe is written for 10 servings. Multiply each ingredient by (your serving target / 10). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.

Is Sourdough Discard Banana Bread with Walnuts gluten-free?

Yes — this recipe is tagged gluten-free based on its ingredient list. Always cross-check labels for packaged ingredients (sauces, broths, condiments) since formulations vary by brand.

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