How to Make a Rustic Sourdough Potato Bread

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Sourdough potato bread is one of those rare loaves that feels both rustic and indulgent. Bakers have added potato to bread dough for generations because the natural starches lock in moisture, extend shelf life, and create an exceptionally tender crumb. In this version, mashed russet potato blends directly into the dough, giving the interior a plush, feathery texture while still allowing for a bold, blistered crust.

The potato brings subtle sweetness and nutritional benefits — including potassium, vitamin C, and slow‑digesting starches that help the loaf stay soft for days. When paired with a lively levain (the offshoot of your sourdough starter used to leaven the dough), the dough becomes silky and extensible, developing deep flavor through long fermentation. Optional diastatic malt powder boosts oven spring and color, giving the finished loaf a bakery‑quality look and aroma.

For anyone searching for sourdough potato bread or a beautifully rustic potato loaf, this recipe delivers softness, structure, and exceptional keeping quality. It follows a classic sourdough workflow with stretch‑and‑folds, long fermentation, and a high‑hydration dough that becomes smoother as the potato integrates.

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Yield:

1 large boule (approx. 900–950g finished weight)

Equipment:

• Wire rack
• Kitchen scale
• Measuring cups/spoons
• Small saucepan
• Colander
• Potato masher or fork
• Quart‑sized container with lid (for levain)
• Large mixing bowl
• Spoon or dough whisk
• Damp cloth
• Spray water bottle (optional)
• Bench scraper
• Parchment paper
• 9″ banneton
• Bread lame or sharp blade
• Dutch oven with lid
• Suggested: cast‑iron skillet or heavy pan for ice steam
• Digital baking thermometer

Ingredients:

• 1 medium russet potato (225g raw, unpeeled)
• 180g levain (from 50g starter, 80g water, 80g flour; fermented 6 hours)
• 250g water
• 2 TBSP softened butter (30g)
• 2 TBSP sour cream (20g)
• ½ tsp coarse black pepper (1g)
• 450g bread flour (or all‑purpose)
• 1 TBSP diastatic malt powder (optional, can help boost rise, texture, and crust)
• 14g salt
• Optional: several cups of ice (for steam pan)

Directions:

1. Cook and prep the potato: Place the unpeeled potato in a saucepan, cover with cold water, and simmer 35–40 minutes until very soft. Drain, cool slightly, peel, and weigh out 150g cooked potato. Add a few tablespoons of the 250g dough water to help mash. Mash mostly smooth and let cool completely.

2. Build the levain: Mix 50g starter, 80g water, and 80g flour in a quart container. Cover and ferment ~6 hours, until bubbly and domed.

3. Mix the dough: Dissolve the levain in the remaining dough water, then stir in the mashed potato. Add butter, sour cream, and pepper. Add flour and optional malt powder, sprinkle salt on top, and mix until shaggy and fully hydrated. Cover and rest 30 minutes.

4. First fold: Perform 6–8 stretch‑and‑folds around the bowl. Mist with water spray bottle. Cover and rest 30 minutes.

5. Second fold: Repeat the stretch‑and‑folds and misting. Cover and rest 30 minutes.

6. Third fold: Perform another round of stretch‑and‑folds, finishing with one gentle coil fold. Mist and cover, rest 30 minutes.

7. Fourth fold: Repeat the stretch‑and‑folds and finish with another coil fold. Mist. Cover and let rise 3–4 hours, until puffy and nearly doubled.

8. Pre‑shape: Turn the dough onto a lightly floured surface, form a loose round, and rest 10 minutes. if the dough is very sticky, you may lightly flour it as well.

9. Final shape: Shape into a tight boule and place seam‑side up in a floured banneton.

10. Cold proof: Cover and refrigerate 12–24 hours for improved flavor, structure, and scoring. The dough should be nearly at the surface of the banneton. You can place it in the freezer for the final 30 minutes before placement in the pre-heated oven, as desired, to help maintain structure while scoring.

11. Preheat the oven: Place the Dutch oven (lid on) inside and heat to 485°F (250°C) for 50–60 minutes. If using a steam pan, place a cast‑iron skillet on the bottom rack.

12. Score and load: Turn the dough onto parchment and score. Remove the Dutch oven. If using a steam pan, add several cups of ice to the hot skillet. Lower the dough into the Dutch oven, cover, and return it to the oven.

13. Bake: Bake covered for 22 minutes at 485°F. Remove the lid (and steam pan if using), reduce to 465°F, and bake 20 more minutes or until the loaf reaches 205–210°F internally.

14. Dry the crust: Turn off the oven, crack the door, and leave the loaf inside 20–25 minutes.

15. Cool: Cool completely on a wire rack for 6–8 hours (or overnight) before storing or slicing.