Sweet Potato Sourdough Sandwich Loaf

Looking for a simple way to add a little extra nutrition to your homemade bread without sacrificing flavor or texture? This Sweet Potato Sourdough Sandwich Loaf is the perfect solution. By incorporating sweet potato into a classic sourdough sandwich bread, you get a loaf that is incredibly soft, lightly sweet, and wonderfully versatile. It is one of those recipes that quietly delivers wholesome ingredients while tasting so good that even picky eaters happily reach for another slice.

Sweet potatoes are naturally rich in vitamins, minerals, and fiber, making them a great addition to everyday baking. When blended into bread dough, they contribute moisture, tenderness, and a subtle sweetness that enhances the overall flavor without overpowering it. The result is a beautiful loaf with a delicate crumb, a golden hue, and a texture that stays soft for days.

The sourdough fermentation adds another layer of flavor and complexity to the bread. It creates a gentle tang that balances the sweetness of the sweet potato beautifully. At the same time, the natural fermentation process helps develop a rich aroma and satisfying depth of flavor that sets this loaf apart from standard sandwich bread. The combination of sweet potato and sourdough creates a loaf that feels both comforting and special.

For breakfast, try toasting a slice and serving it with your favorite spread. The subtle sweetness becomes even more pronounced when toasted, creating a warm and comforting start to the day. It also makes excellent French toast, adding extra flavor and softness to a classic breakfast favorite.

Give this Sweet Potato Sourdough Sandwich Loaf a try and discover how easy it can be to sneak a little extra goodness into your daily baking. Soft, flavorful, lightly sweet, and kid-approved, it may quickly become a favorite in your home. Find the full recipe below and enjoy every slice.

Ingredients

Sourdough starter

• 7g sourdough starter
• 35g water
• 35g bread flour

Dough

• 300g bread flour (100%)
• 125g roasted and mashed sweet potato
• 125g water
• 30g soft or melted butter(10%)
• 9g honey (3%)
• 60g of levain (20%)
• 6g salt (2%)
• 0.5 g dry yeast (optional, to reduce the sourness)

Directions 

Day 1

Starter 

• 10 pm add starter to the water and whisk together, add flour, mix well, cover loosely, let it sit at a room temp 74-78F for about 8-10 hours until starter reaches its peak (at least triples in volume).
• Roast the sweet potato and let it cool. Mash it.

Day 2

Dough

• 8 am mix water, flour, sweet potato, honey, sourdough starter (60g on its peak, the rest use for future feedings), let it autolyse for 1 hour. During the autolyse process the flour becomes fully hydrated. This activates gluten development.

• 9 am mix dough on low speed of your mixing machine for 2-3 minutes, or KitchenAid on speed 3 for 3-4 minutes until well incorporated.
• Add salt, mix for a couple more minutes. The dough should come up together.

• Add soft butter, increase the speed to medium and mix for 10 more minutes until the dough is well incorporated and comes up together.
• Perform a windowpane test. Wet your hands and stretch the dough. You should be able to stretch it very thin, that’s a sign of a well
• developed gluten, and that your final product will have a soft and light structure.

• Cover and let the dough proof for 3-4 hours at 76-80F/ 24-28C.
• During that time perform 2 stretches and folds.
• The dough should become slightly puffy.

• 1 pm transfer the dough to the fridge for cold fermentation till the evening (for 8-9 hours).
• 10 pm remove the dough from the fridge.

• Shape as desired. I rolled it into a long roll same length as a baking/loaf pan.
• Put a sheet of parchment paper on the bottom of your loaf pan.
• Transfer the shaped loaf into the loaf pan.
• Cover the dough and let it proof overnight 76F /24C until it doubles or more in volume. About 7-9 hours. Usually it doubles or more in volume by morning (6-7 am).

Day 3

• 7 am sprinkle some flour on top of your loaf.
• Preheat the oven to 375F.
• Bake for 35-40 minutes until golden brown.

Enjoy your sweet potato sourdough sandwich loaf.

Sweet Potato Sourdough Sandwich Loaf

1622kcal

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Prep 45 minutes mins

Cook 40 minutes mins

Total 1 day d 3 hours hrs 25 minutes mins

Super soft, airy, and boasting a subtle natural sweetness, this sandwich bread introduces mashed sweet potato directly into a sourdough matrix. Enriched with real honey and softened butter, it is a nutrition-boosting pan loaf that holds fresh elasticity for days and serves as an excellent kid-approved base for both sweet and savory toppings.

Cuisine American / Creative Sourdough

Ingredients

Sourdough Starter (Night Before)

• ▢ 7 g Sourdough starter culture
• ▢ 35 g Water
• ▢ 35 g Bread flour

The Sweet Potato Dough

• ▢ 300 g Bread flour (100%)
• ▢ 125 g Roasted and mashed sweet potato (cooled completely)
• ▢ 125 g Water
• ▢ 30 g Unsalted butter, softened or melted (10%)
• ▢ 9 g Honey (3%)
• ▢ 60 g Active levain (20% – From the stage above)
• ▢ 6 g Fine sea salt (2%)
• ▢ 0.5 g Dry instant yeast (Optional – used purely to diminish sharp sour notes)

Equipment

• ▢
  9×5 Inch Standard Loaf Pan (Perfectly sized to cradle the high-rising sandwich loaf structures vertically)
• ▢
  Stand Mixer (Highly recommended to smoothly emulsify the sweet potato, honey, and butter fat barriers)
• ▢
  Kitchen Scale
• ▢
  Bench Scraper
• ▢
  Parchment Paper

Method

Prevent Sleep ModePrevent Sleep Mode

Night Before – Sourdough Levain & Prep Work

1. 10:00 PM – Levain Stabilization: In a clean glass jar, whisk the 7g of starter culture into 35g of water until loose. Stir in 35g of bread flour. Mix until smooth, cover loosely, and leave at a room temperature of 74–78°F (23–26°C) overnight for 8 to 10 hours until it triples in volume.
2. Sweet Potato Processing: Roast a fresh sweet potato in its skin until completely tender. Allow it to cool down to room temperature, peel off the skin, and mash the flesh smoothly with a fork or ricer to remove all lumps. Set aside for the morning.

Day 2 – Autolyse, High-Fat Emulsification & Cold Retard

1. 8:00 AM – The Potato Autolyse: In your stand mixer bowl, combine all 125g of water, 300g of bread flour, 125g of your cooled mashed sweet potato, 9g of honey, and 60g of your active overnight levain (plus the optional 0.5g of dry yeast if using). Stir thoroughly with a heavy spoon until a shaggy, dense dough mass forms. Cover and let rest for 1 full hour to completely hydrate the starches and activate early gluten networks.
2. 9:00 AM – Primary Gluten Mixing: Secure the bowl onto your stand mixer fitted with the dough hook. Mix on a low speed for 2 to 3 minutes (or KitchenAid speed 3 for 3 to 4 minutes) until a cohesive structure forms. Sprinkle in the 6g of fine sea salt and continue mixing for 2 more minutes until fully incorporated.
3. Fat Integration & Emulsification: Add the 30g of softened or melted butter. Raise the mixer speed to medium and knead continuously for 10 minutes. The high-fat matrix will gradually integrate, clearing the sides of the bowl completely to leave a smooth, pliable dough.
4. The Windowpane Verification: Wet your hands with water, pinch a portion of the dough, and stretch it gently upward. It should stretch into a translucent, paper-thin windowpane membrane without tearing, signaling proper gluten formation.
5. Bulk Proofing Window: Cover the bowl tightly and leave it to ferment at a warm room temperature for 3 to 4 hours. The dough should look visibly relaxed, light, and slightly puffy to the touch.
6. 1:00 PM – Cold Fermentation Retard: Slide the entire covered container directly into your refrigerator to chill down the butter fats and stabilize the dough structures for 8 to 9 hours until the late evening.

Day 2 (Night) – Log Tension Shaping & Overnight Pan Rise

1. 10:00 PM – Loaf Shifting & Tension Roll: Remove the chilled, firm dough from your refrigerator and tip it cleanly onto a lightly floured work surface. Using a rolling pin or your hands, flatten and shape the dough into a tight, uniform log matching the exact length of your 9×5 loaf pan.
2. Pan Setup & Placement: Line the bottom of your 9×5 inch loaf pan with a sheet of parchment paper (lightly oiling the paper is recommended for a clean release). Place your shaped log seam-side down into the pan.
3. The Long Overnight Ambient Rise: Cover the loaf pan loosely with plastic wrap. Let it proof overnight on your kitchen counter for 7 to 9 hours at a stable room temperature around 76°F (24°C). By morning, the wild yeasts will have worked steadily, allowing the dough to double or rise slightly over the pan rim into an airy, light crown.

Day 3 – The Golden Sandwich Bake

1. 7:00 AM – The Morning Bake: Preheat your home oven to 375°F (190°C). Dust the top crown of your beautifully risen sweet potato loaf with a very light coating of flour for a rustic look.
2. Baking Cycle: Slide the pan onto the center rack of your oven and bake for 35 to 40 minutes until the top crust turns a uniform, rich golden brown. Carefully turn the bread out of the loaf pan onto a wire cooling rack and let it cool down entirely before slicing into sandwich portions.

Nutrition

Calories1622kcalCarbohydrates289gProtein44gFat30gSaturated Fat16gPolyunsaturated Fat3gMonounsaturated Fat7gTrans Fat1gCholesterol65mgSodium2414mgPotassium773mgFiber12gSugar14gVitamin A18490IUVitamin C3mgCalcium102mgIron4mg

Notes

– **The Softness Secret of Starch Retaliation:** Incorporating real mashed sweet potato introduces gelatinized starches and natural moisture into the wheat protein chains. This alters the starch retrogradation curve significantly, blocking the bread from drying out quickly and ensuring your sandwich slices stay incredibly soft and pillowy for up to 3-4 days without chemical preservatives.

– **Why Cold Retard Trumps Lean Dough Profiles:** Forcing a solid 8-hour cold fermentation step into the refrigerator before shaping serves an essential physical purpose here. The inclusion of real butter makes the warm dough highly elastic and sticky; chilling the dough hardens the fat matrices completely, allowing you to execute a high-tension log roll easily without ripping the dough skin.

– **Troubleshooting Warm Weather Environments:** If your kitchen runs notably hot (above 85°F/29°C), your stand mixer motor can overheat easily when emulsifying high-fat doughs for 10 minutes. If the dough starts getting hot or greasy, stop the mixer immediately, slide the bowl into the refrigerator for 10-15 minutes to cool the fats down, and then resume mixing.

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