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America's Test Kitchen sourdough bread recipe delivers restaurant-quality loaves with a signature foil-sealed crust and foolproof rise every time. After testing countless variations, their method combines precise fermentation times with a simple sealing technique that creates a crispy, caramelized exterior while keeping the interior tender.
The key lies in understanding your starter's strength and adjusting fermentation accordingly—no more guessing games or dense, underproofed loaves.
What sets this recipe apart is the three-stage fermentation process, where bulk fermentation, shaping, and final proofing are all carefully timed to your kitchen's temperature. America's Test Kitchen's research reveals that most home bakers either overproof or underproof their dough, leading to disappointing results.
This method accounts for those variables with clear adjustments, ensuring a consistent rise and open, airy crumb structure. The foil-sealing technique during the last 20 minutes of baking creates that coveted crispy crust without burning the bread.
By following these exact steps—from maintaining your starter to scoring the loaf—you'll achieve sourdough bread with a golden, shatteringly crisp crust and an interior so light it practically melts in your mouth.
The aroma alone will transform your kitchen into a bakery, and the flavor develops over time, becoming more complex with each day. This is the kind of bread that makes you want to bake every weekend, not just for sandwiches but as a centerpiece for any meal.
Whether you're a first-time sourdough baker or looking to refine your technique, this recipe's fail-safe approach ensures success. The detailed troubleshooting section addresses common issues like dense crumb or uneven rise, while storage tips keep your bread fresh for up to five days.
Let's get started on creating your perfect loaf.
Ingredients for america's test kitchen sourdough bread
Precision ingredients for restaurant-quality sourdough with foolproof rise and crispy foil-sealed crust every time.
| Ingredient | Amount | Notes |
|---|---|---|
| Active Sourdough Starter 🍞 | ½ cup | 100% hydration, bubbly and active |
| All-Purpose Flour 🌾 | 4 cups | Unbleached, King Arthur preferred |
| Whole Wheat Flour 🌾 | ½ cup | For added flavor and texture |
| Granulated Sugar 🍚 | ½ tsp | Feeds starter for fermentation |
| Kosher Salt 🧂 | 1 ½ tsp | Diamond Crystal preferred |
| Water 💧 | 2 ½ cups | Filtered or dechlorinated |
| Olive Oil 🫒 | ½ tbsp | Extra-virgin for richness |
| Cornmeal 🌽 | ¼ cup | For dusting baking surface |
| Aluminum Foil 📄 | 1 sheet | Heavy-duty, for sealing crust |
The sourdough starter is non-negotiable here—it must be 100% hydration and actively bubbling. If yours isn't ready, King Arthur's sourdough starter kit is a reliable shortcut. For flours, King Arthur all-purpose and whole wheat create the perfect balance of structure and flavor. The Diamond Crystal kosher salt is key—it dissolves more cleanly than table salt. Water quality matters too; if yours is heavily chlorinated, let it sit out overnight to off-gas. The olive oil** adds richness that makes this bread worth the effort—don't substitute with vegetable oil, which can taste harsh.
No sourdough starter? Instant Pot sourdough starter works in 24 hours, or use a reliable discard from a trusted source. Running short on whole wheat? Spelt flour at the same amount gives similar texture. The cornmeal is optional but creates a beautiful crust—Bob's Red Mill is the gold standard. For the foil sealing, heavy-duty Reynolds Wrap works best; avoid non-stick foil that can tear. Temperature is critical: if your kitchen runs hot, reduce fermentation times by 20-30%. The sugar feeds the starter but won't make your bread sweet—it's all about the fermentation process.
Freshly baked loaves stay crisp for 2 days at room temperature, wrapped in a clean kitchen towel. For longer storage, freeze fully cooled loaves in ziplock bags—they'll keep for 3 months. To revive, warm at 350°F for 10 minutes. The crust develops more flavor over time, so slice just before serving. For maximum aroma, bake when your kitchen is empty—this bread transforms any space into a bakery. Leftovers? Toast them—second life guaranteed.
Why You'll Love This Recipe
- Foolproof Ferment: Honestly, this recipe doesn’t demand perfection—just a fed starter and a few basic steps. The whole wheat flour adds depth without complicating things, and the sugar-kosher salt combo balances the tang perfectly on the first try.
- Crusty-Creamy Magic: That crispy, golden crust with a pillowy interior? It’s what makes this bread ridiculously good. The starter’s tang cuts through the richness, while the whole wheat gives it a subtle nuttiness that keeps you reaching for seconds.
- Weeknight Workhorse: I bake a loaf every Sunday, and it’s always there for toast, sandwiches, or charcuterie boards. The dough’s forgiving—no kneading, no fuss—and it freezes beautifully for lazy mornings.
- Budget-Friendly Staple: Five ingredients, zero waste. That whole wheat flour stretches the dough, and the sugar/salt ratio keeps costs low while maximizing flavor. Plus, a single batch feeds my family for days—no sad bread scraps here.
Step-by-step instructions for america's test kitchen sourdough bread
Mastering this foolproof method guarantees a crust so crisp it crackles and a crumb so open it defies gravity.
Autolyse the Dough for Maximum Development
In a large mixing bowl, combine the 4 cups all-purpose flour and the 0.5 cup whole wheat flour. Make a well in the center and add the 0.5 cup active sourdough starter and 2.5 cups water. Using a wooden spoon or your hands, gently mix until just combined—you'll see shaggy strands forming but no dry bits remaining. This initial hydration period, called an autolyse, allows the flour to fully absorb moisture and begin gluten development before we add salt.
Cover the bowl with a damp kitchen towel and let rest for 30 minutes. You'll notice the dough transform—it'll become smoother and more elastic as gluten strands relax. This step ensures a lighter, more open crumb later. I like to set a timer so I don't forget, as this waiting period is crucial for professional-quality results.
Incorporate Salt and Olive Oil for Structure
After the autolyse, sprinkle the 1.5 tsp kosher salt and 0.5 tbsp olive oil over the dough. Using your hands, gently work these into the dough until fully incorporated. The salt should dissolve completely, and the oil should coat the dough evenly. At this point, the dough will feel slightly tacky but should come together when pressed.
Turn the dough out onto a lightly floured surface and perform a series of stretch-and-folds every 30 minutes for 2 hours. To do this, grab one side of the dough, stretch it upward, and fold it over itself. Rotate the dough a quarter turn and repeat. This technique builds strength and elasticity in the gluten network, which translates to better oven spring and structure. You'll know you're on track when the dough becomes smoother and more resistant to stretching.
Bulk Ferment Until Peaked and Bubbly
After the final stretch-and-fold, shape the dough into a loose round and place it back in the bowl. Cover again and let ferment at room temperature for 4-6 hours, depending on your kitchen's temperature. The dough should roughly double in size and develop numerous bubbles on the surface. I test readiness by performing the "poke test"—gently press your finger into the dough. If it springs back slowly (like Jell-O), it's ready for shaping.
This fermentation stage is where all the magic happens. The yeast and bacteria in your sourdough starter work together to develop complex flavors and create that signature tang. The longer you ferment (within reason), the more flavorful your bread will be, but don't exceed 8 hours or the dough may overproof. Keep an eye on it, especially if your kitchen is warm.
Shape and Seal for Maximum Crust Development
Turn the dough out onto a surface dusted with 0.25 cup cornmeal and shape it into a tight round loaf. To do this, grab the dough from the sides and pull it upward while rotating the bowl, allowing the dough to wrap around itself like a cinnamon roll. Seal the seam by pressing gently with your fingers. Place the shaped loaf seam-side down on a parchment-lined baking sheet.
Cut a large piece of the aluminum foil (about 12x12 inches) and place it over the dough, pressing down gently to create a tight seal. This foil sealing technique is what gives this bread its signature crackling crust. The sealed environment traps steam during baking, creating the perfect conditions for that crisp exterior while maintaining a soft interior. Let the dough proof for 1-2 hours until it has visibly risen and the foil shows signs of expansion.
Bake with Precision for Perfect Results
Preheat your oven to 450°F with a baking stone or inverted baking sheet inside for 1 hour. This ensures even heat distribution and proper steam generation. Remove the foil from the dough and make a deep slash down the center using a razor blade or sharp knife—this prevents excessive expansion and creates that beautiful ear-like crust. Bake for 25-30 minutes until the bread is deep golden brown and sounds hollow when tapped on the bottom.
The internal temperature should reach 205-210°F when measured with an instant-read thermometer. This high temperature ensures complete starch gelatinization and maximum crispness. As soon as it's done, transfer the bread to a wire rack to cool completely. The crust will continue to crisp up as it cools, developing that perfect snap you're after. Serve warm with your favorite butter or olive oil for the ultimate experience.
Pro Tips For Making America'S Test Kitchen Sourdough Bread
- Weigh Your Flours: The recipe calls for precise ratios, and kitchen scales are your best friend here—especially for the whole wheat flour. I used to eyeball it, but the texture changes dramatically when you’re off by even 10 grams. Whole wheat absorbs moisture differently, so don’t skip this step, even if your scale is old.
- Skip the Over-Kneading: This isn’t your grandma’s bread—it’s a stretch-and-fold job, not a punishing knead. I learned this after three batches of tough, chewy loaves. The dough should look shaggy but cohesive after folds; if it’s smooth, you’ve overworked it. Let the gluten develop naturally during the bulk ferment.
- Proof at 78°F (25°C): The recipe’s magic number is 78°F, but most homes hover around 70°F. If your kitchen’s cooler, move the dough to a warm spot—like a turned-off oven with a bowl of hot water inside. I used to rush this, and my bread would either collapse or rise unevenly. A lazy thermometer ($10) fixes this forever.
- Steam the Oven: Don’t just spray water—place a metal tray on the bottom rack and pour 1 cup of boiling water in when you load the bread. The steam lasts longer and gives you that perfect oven spring. I tried the spray method, and my crusts were pale and sad. This method guarantees a crisp, blistered top.
Essential equipment for this recipe
Starter Essentials
Your sourdough starter is the heart of this recipe, so invest in quality tools to maintain it. A glass jar with a lid (I love the Le Creuset 2-quart jar) keeps it visible for monitoring bubbles while preventing contamination.
For daily feeding, a small digital kitchen scale (like the OXO Good Grips) ensures precise 1:1:1 ratios of starter, flour, and water—critical for consistency. Store your starter in a warm spot (75-78°F is ideal), so I keep mine on top of my fridge. 🍞
Mixing and Fermenting
A large stainless steel mixing bowl (like the ZWC Premium) is perfect for autolyse and bulk fermentation—it won’t retain odors like plastic. For stretch-and-folds, use a wooden dough scraper (the La Brea Wooden Dough Scraper) to prevent sticking.
A digital thermometer (I recommend the Thermoworks Sous Vide) helps track your kitchen’s temperature, which directly impacts fermentation times. Cover your dough with a damp kitchen towel or humidity dome (like the Norpro Proofing Dome) to maintain moisture during resting periods.
Baking Precision Tools
For baking, a baking stone (the West Bend Stoneware) or inverted baking sheet creates the steam needed for that crisp crust. Preheat it for at least 1 hour to ensure even heat distribution.
A razor blade (like the Mercer Culinary) is essential for clean scoring—never use a serrated knife, as it tears the dough. For monitoring doneness, an instant-read thermometer (the Thermapen One) is a game-changer; aim for 205-210°F internal temperature.
A wire cooling rack (the OXO Good Grips) keeps your loaf from getting soggy as it cools.
Foil Sealing Setup
Heavy-duty aluminum foil (like Reynolds Wrap) is non-negotiable for the sealing technique. Cut a 12x12-inch square to fully cover your loaf—this creates the steam trap that delivers that signature crust. For shaping, a lightly floured surface (I use King Arthur all-purpose flour) prevents sticking.
A parchment-lined baking sheet (like Ghirardelli) makes cleanup effortless and ensures even browning. Pro tip: Keep a small spray bottle (like the SimpleHouseware) of water handy to mist the foil if it dries out during proofing.
Nutrition facts
Frequently asked questions
How do I know if my sourdough starter is ready for this recipe?
The starter should be 100% hydration, bubbly, and have a rising volume that doubles in 4-6 hours after feeding. It should also have a pleasantly tangy aroma (not vinegary or flat). If it floats in water, it's ready. For best results, feed it 12-24 hours before baking to ensure peak activity.
Why does America's Test Kitchen use foil sealing for the crust?
The foil creates a steam trap during baking, which develops the signature crispy, caramelized crust while keeping the interior tender. Removing it just before the final 20 minutes allows for proper browning. This technique eliminates the guesswork of traditional steam methods while ensuring consistent results every time.
What if my dough doesn't rise enough during bulk fermentation?
Underproofed dough often results from cold kitchen temperatures or a weak starter. Try these fixes: increase fermentation time by 1-2 hours, move the dough to a warmer spot (like near the oven with light on), or feed your starter with whole wheat flour for extra strength. If it still doesn't rise, your starter may need refreshing.
Can I make this recipe without a baking stone?
Yes! Use an inverted baking sheet placed on the middle rack to create steam. For even better results, place a metal bowl of boiling water on the lower rack during the first 10 minutes of baking. This mimics the stone's heat retention and steam generation. Just preheat the oven for at least 1 hour to ensure proper temperature.
How do I store sourdough bread to keep it fresh longer?
For 2 days, wrap the cooled loaf in a clean kitchen towel (not plastic) to prevent sogginess. For longer storage, freeze fully cooled slices in a ziplock bag for up to 3 months. To revive, warm at 350°F for 5-10 minutes**. The crust actually improves over time—slice just before serving for maximum flavor.