Moist Banana Bread Recipe Using Sourdough Discard

This sourdough discard banana bread is my go-to whenever there’s extra discard in the fridge and ripe bananas on the counter. It’s moist, tender, and subtly tangy—perfect for breakfast, brunch, or a quick snack.

Sourdough Banana Bread

Whenever bananas are full of brown spots, I bake banana bread. It’s an easy, comforting loaf that the whole family enjoys. Because I bake sourdough regularly, I often have discard to use up. I adapted my favorite banana bread to include a small amount of sourdough discard for extra moisture and a gentle tang that brightens the flavor without overpowering it.

Ingredients You’ll Need and Helpful Tips

Below are the ingredients used in this recipe. See the recipe section for exact measurements and printable instructions.

• Bananas: Use very ripe bananas with lots of brown spots for the best sweetness and flavor.
• Sourdough discard: Adds a mellow tang and keeps the loaf tender. You only need a small amount.
• Unbleached all-purpose flour: Gives a tender crumb. You can substitute up to half with white whole wheat for more fiber.
• Baking soda + baking powder: Using both helps the loaf rise well even with the extra liquid from discard and bananas.
• Salt: Balances sweetness and improves texture.
• Butter: A small amount keeps the bread moist—substitute with plant-based butter or coconut oil for a dairy-free version.
• Light brown sugar: Adds depth; you can use a low-carb brown monk fruit alternative if desired.
• Egg + egg white: A whole egg plus an extra egg white adds structure and helps the loaf rise.
• Vanilla extract: For flavor.

Testing Notes from My Kitchen

I tested this loaf multiple times to get the right balance. Early versions were too flat because the discard and bananas added moisture. Adjusting the flour amount, reducing some liquid, and adding baking powder alongside baking soda improved the rise. The extra egg white gives just enough structure to set the crumb without drying it out. The final result is moist, tender, and slightly tangy—exactly what I want in banana bread.

How to Make Sourdough Discard Banana Bread

The method is straightforward: prepare wet and dry mixtures separately, combine gently, then bake. Follow the recipe instructions below for consistent results.

1. Mash the bananas until mostly smooth, then stir in the sourdough discard.
2. Whisk the dry ingredients—flour, baking soda, baking powder, and salt—in a separate bowl.
3. Combine wet ingredients: Beat the butter and brown sugar until light. Add the whole egg, egg white, and vanilla, then stir in the banana-discard mixture.
4. Fold in dry ingredients with a spatula until just combined; do not overmix.
5. Bake: Pour batter into a prepared loaf pan lined with parchment paper and bake at 350°F (175°C) for about 40–45 minutes, or until a toothpick inserted in the center comes out clean or with a few moist crumbs.
6. Cool: Lift the loaf from the pan using the parchment overhang and transfer to a wire rack to cool completely before slicing.

Variations

This recipe is very adaptable. Try one of these ideas to make the loaf your own:

• Chocolate chips: Fold in 1/3 cup of mini or regular chocolate chips.
• Chocolate swirl: Melt 1/3 cup chocolate, pour over the batter, and swirl with a toothpick.
• Nuts: Add 1/3 to 1/2 cup chopped walnuts or pecans for crunch.
• Warm spices: Add 1 teaspoon ground cinnamon or a pinch of nutmeg.
• Dairy-free: Use plant-based butter or 1 ounce coconut oil (melted and cooled) instead of butter.
• Whole wheat: Replace up to half of the all-purpose flour with white whole wheat for a heartier loaf.
• Muffins: Divide batter into 12 muffin cups and bake at 350°F for 18–22 minutes.

Recipe — Sourdough Discard Banana Bread

Yield: 13 servings (about 13 slices). Serving size: 1 slice.

Prep: 15 minutes • Cook: 45 minutes • Cooling time: 15 minutes • Total: 1 hr 15 mins

Ingredients

• 1 1/2 cups ripe bananas, mashed (about 13 oz or 3½ to 4 medium bananas)
• 1/4 cup sourdough discard
• 1 1/8 cups unbleached all-purpose flour (about 6.75 oz; 1 cup + 2 tbsp)
• 1 teaspoon baking soda
• 1/2 teaspoon baking powder
• 1/4 teaspoon salt
• 2 tablespoons unsalted butter, softened (about 1 oz)
• 1/2 cup packed light brown sugar (or brown monk fruit)
• 1 large egg
• 1 large egg white
• 1 teaspoon vanilla extract
• Baking spray and parchment paper for the pan

Instructions

1. Preheat oven to 350°F. Spray a metal loaf pan with baking spray and line it with parchment, leaving an overhang for easy removal.
2. Mash bananas until mostly smooth with a few chunks and stir in the sourdough discard.
3. Whisk together flour, baking soda, baking powder, and salt.
4. Beat butter and brown sugar until light and fluffy, about 1–2 minutes. Add the egg, egg white, and vanilla; mix until smooth. Stir in the banana mixture.
5. Fold the dry ingredients into the wet until just combined—do not overmix.
6. Pour batter into the prepared pan and smooth the top. Bake 40–45 minutes, or until a toothpick inserted in the center comes out clean or with a few moist crumbs.
7. Use the parchment overhang to lift the loaf from the pan and cool completely on a wire rack before slicing.

Notes

• For a higher rise, don’t skip the baking powder or the extra egg white.
• Always use ripe bananas for best flavor and natural sweetness.

Storage

• Room temperature: Store covered at room temperature for up to 3 days.
• Refrigerator: Keeps up to 1 week; bring to room temperature or warm slightly before serving.
• Freezing: Freeze individual slices wrapped in parchment or plastic wrap in a freezer-safe bag for up to 3 months.

Nutrition (per slice)

Calories: 110 kcal • Carbohydrates: 20.5 g • Protein: 2.5 g • Fat: 2 g • Fiber: 1 g • Sugar: 8.5 g • Cholesterol: 19 mg • Sodium: 149 mg • Saturated fat: 1.5 g

FAQ

More Banana Bread Ideas

If you love banana bread, try these variations and flavor combinations at home:

• Banana Nut Bread
• Blueberry Banana Bread
• Gluten-Free Banana Nut Bread
• Pumpkin Banana Bread
• Chocolate Oat Flour Banana Bread