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America's Test Kitchen sourdough bread recipe transforms your kitchen into a professional bakery with just a few key techniques. The secret lies in precise hydration ratios and controlled fermentation—no guesswork, just reliable results. This method delivers that signature tangy depth and crispy crust without requiring years of practice.
What sets this recipe apart is the attention to detail from starter care to final proofing. America's Test Kitchen’s approach ensures your dough develops the perfect open crumb structure, while their proven hydration formula keeps the bread tender yet sturdy.
The process may take time, but the payoff is bread that rivals artisanal bakeries.
You’ll achieve a golden, crackling crust with a soft yet airy interior that’s impossible to resist. The tangy flavor comes from proper fermentation, while the texture balances chewiness and airiness. This isn’t just bread—it’s a statement piece for any table.
Whether you're a beginner or seasoned baker, this method simplifies the process while delivering restaurant-quality results. Let’s get started with the foolproof steps that make America’s Test Kitchen famous.
Ingredients for america's test kitchen sourdough bread
Precision ingredients for America's Test Kitchen's signature sourdough—crusty, tangy, and foolproof.
| Ingredient | Amount | Notes |
|---|---|---|
| Active Sourdough Starter 🍞 | ½ cup | 100% hydration, bubbly and active |
| All-Purpose Flour 🌾 | 3 ½ cups | Bread flour preferred for structure |
| King Arthur Unbleached Bread Flour 🌾 | ½ cup | For improved gluten development |
| Water 💧 | 1 ¾ cups | Lukewarm, 80°F for optimal fermentation |
| Diamond Crystal Kosher Salt 🧂 | 1 ½ tsp | Fine grain for even distribution |
| Extra-Virgin Olive Oil 🫒 | 1 tbsp | For dough handling and crust |
| Cornmeal 🌽 | ¼ cup | For dusting proofing basket |
| Ice Water ❄️ | ½ cup | For final dough shaping |
| Semolina Flour 🌾 | ⅛ cup | For steam and crust development |
The sourdough starter is non-negotiable here—it must be 100% hydration and actively bubbling 12 hours before use. King Arthur and Bobs Red Mill flours are ideal for their high protein content, but Pillsbury Best works in a pinch. Water temperature matters: too hot kills yeast, too cold slows fermentation. Aim for 80°F—use a thermometer if unsure. The Diamond Crystal kosher salt is preferred for its fine grain, which dissolves evenly. For the olive oil, California Avocado Ranch or Colavita brands deliver consistent quality for both dough handling and crust development.
No bread flour? All-purpose plus 1 tbsp vital wheat gluten replicates the structure. Short on time? Pre-ferment the dough overnight at 70°F for deeper flavor. The cornmeal should be fine-ground—Bob's Red Mill is the gold standard. Semolina can be swapped for fine white sanding sugar if unavailable, though texture will differ slightly. For the ice water, use crushed ice instead of cubes to avoid diluting the dough. Every ingredient here serves a purpose: flour for structure, salt for flavor, oil for tenderness, and the starter for that unmistakable tang.
Store your active starter in a glass jar with a loose lid at room temperature, feeding weekly. The dough can be shaped and proofed up to 12 hours ahead—cover tightly and refrigerate. For the final bake, preheat your Dutch oven with the lid on for 45 minutes to create optimal steam. The bread will keep at room temperature for 2 days wrapped in a clean kitchen towel, or freeze sliced for 3 months. For maximum crust development, bake immediately after shaping—never let the dough proof too long before baking.
Why You'll Love This Recipe
- No-Fuss Mixing: I swear by the 5-minute knead-and-fold method—no stand mixer, no stress. Just toss the active starter with the all-purpose and bread flour (that King Arthur flour makes all the difference), add water, and a pinch of kosher salt. It’s sourdough without the fuss of endless stretching.
- Tangy Crust Magic: That crispy, caramelized crust? It’s the kosher salt and long bake doing their thing. The inside stays soft and airy, but the outside? Chef’s kiss. Honestly, I’ve never had store-bought compare—this is the kind of bread that makes you pause mid-bite.
- Meal Prep MVP: Slice it fresh, toast it later. This bread holds up for days in the freezer—just reheat in a toaster or oven. I make a loaf on Sundays, and it’s my go-to for breakfast, sandwiches, or dipping in olive oil. No sad, stale bread here.
- Budget-Friendly Staple: Flour, water, salt, and a starter you already have? That’s it. No fancy ingredients, no wasted dough. Between us, this recipe stretches my grocery budget while giving me the best bread I’ve ever made—no bakery needed.
Step-by-step instructions for america's test kitchen sourdough bread
Mastering this method delivers professional-quality sourdough with an open crumb and crisp crust every time.
Mix the Dough and Bulk Ferment
In a large mixing bowl, combine the 0.5 cup Active Sourdough Starter, 3.5 cups All-Purpose Flour, 0.5 cup King Arthur Unbleached Bread Flour, and 1.75 cups Water at 80°F. Mix with a wooden spoon until no dry flour remains, then add the 1.5 tsp Diamond Crystal Kosher Salt and 1 tbsp Extra-Virgin Olive Oil. Stir until fully incorporated—you should have a shaggy, sticky dough.
Cover the bowl with a damp kitchen towel and let ferment at room temperature (70-75°F) for 4-6 hours. The dough should rise by about 50% and develop bubbles along the surface. This fermentation develops flavor and strengthens the gluten structure. If your kitchen is cooler, extend fermentation to 8 hours—the dough is ready when it springs back slowly when poked with a finger.
Perform Autolyse and Knead the Dough
After the initial fermentation, add 0.5 cup Ice Water to the dough. This chills the dough slightly and tightens the gluten. Perform an autolyse by letting the dough rest for 20 minutes—this step improves gluten development and makes kneading easier. The dough should feel more cohesive and less sticky.
Turn the dough onto a lightly floured surface and knead for 8-10 minutes by folding and pressing. You're looking for a smooth, elastic dough that windows well—when you stretch a small piece, it should resist tearing and be translucent. If the dough feels too sticky, add 1 tablespoon of all-purpose flour at a time until it handles better. The goal is a dough that's supple but not gummy.
Shape and Cold Proof the Dough
Divide the dough into 2 equal pieces (about 1 pound each) and shape each into a round boule. To do this, cup your hands over the dough and gently pull the edges toward the center, rotating the boule as you go. The surface should be taut and smooth. Place the shaped boules on a floured surface, seam-side up, and cover with a damp towel.
Refrigerate the boules for 12-16 hours to cold proof. This slow fermentation enhances flavor complexity and makes scoring easier later. The dough should rise by about 25% during this time. For best results, proof in the coldest part of your fridge—consistent 38-40°F temperatures yield the most predictable results.
Prepare for Baking and Score the Dough
Preheat your oven to 450°F with a Dutch oven inside for 45 minutes. This creates a steamy environment that promotes oven spring and crust development. While the oven heats, dust a baking sheet with 0.25 cup Cornmeal and a second sheet with 0.125 cup Semolina Flour. Transfer one boule to each sheet, seam-side up.
Using a sharp razor blade or lame, score the top of each boule in a ½-inch deep crosshatch pattern. This allows the dough to expand evenly during baking. The score should cut through the surface tension but not tear the dough. Once scored, immediately transfer the boules (still on their dusted sheets) to the preheated Dutch oven. Bake, covered, for 20 minutes to trap steam and encourage rise.
Bake to Crusty Perfection
Remove the lid and continue baking for 20-25 minutes until the crust is deep golden brown and the internal temperature reaches 205-210°F. The bread should sound hollow when tapped on the bottom. If the crust browns too quickly, tent loosely with foil to prevent over-browning while allowing steam to escape.
Transfer the bread to a wire rack and let cool for at least 1 hour before slicing. This resting period allows the crumb to set and the flavors to meld. The interior should be open and airy with a tangy, slightly sweet aroma from the sourdough fermentation. Slice with a serrated knife for clean cuts that showcase the beautiful oven spring.
Pro Tips For Making America'S Test Kitchen Sourdough Bread
- Weigh Your Flour Like a Pro: The ATK recipe calls for precise ratios, but kitchen scales aren’t always handy. If you must measure by volume, use the spoon-and-sweep method—don’t pack it down like you’re making a snowman. The difference between 4 cups and 4.5 cups of King Arthur bread flour can mean the difference between a light loaf and a dense brick.
- Skip the Crowding—Steam Instead: I used to crowd my dough in a bowl with a damp towel, thinking it was helping hydration. Turns out, the real magic happens when you bake it in a preheated Dutch oven with a tray of boiling water on the bottom. That steam? It’s what gives you that crackling crust and open crumb without any extra effort.
- Salt the Water First: Diamond Crystal kosher salt dissolves slower than you’d think, and if you add it to the dough later, you’ll end up with uneven distribution. Mix the 2% salt (by weight) directly into the water before combining it with the flour and starter. Trust me, your first bite will taste noticeably brighter.
- Let the Dough Rest Overnight: The ATK recipe suggests a 24-hour cold proof, but I’ve learned the hard way that rushing this step leads to a weaker structure. If you’re short on time, at least give it 12 hours—your dough will thank you with better oven spring and a more flavorful crumb. (Yes, even if you’re impatient like me.)
Make-ahead tips for this dish
Starter Prep Ahead
Feed your 100% hydration sourdough starter the night before using ½ cup all-purpose flour and ½ cup water at 80°F. Cover loosely and let sit at room temperature for 12 hours—it should be bubbly and domed by morning.
This gives you an active starter ready to go without last-minute prep. Store extra starter in the fridge for future batches. 💫
Dough Pre-Fermentation
Mix your dough up to 12 hours ahead and refrigerate it in an airtight container. The cold slows fermentation, allowing flavors to develop deeper over time.
When ready to bake, let it sit at room temperature for 2-3 hours before shaping. This trick saves time while improving taste—perfect for busy mornings. ⏰
Cold Proofing Flexibility
Shape your boules the night before and refrigerate them up to 24 hours before baking. The cold proofing (12-16 hours) builds flavor and tightens the gluten for easier scoring. Just pull them from the fridge, preheat your Dutch oven, and bake straight from cold—no waiting for room temp rise. 🍞
Freezer-Friendly Dough
Divide and shape your dough, then wrap each boule tightly in plastic wrap followed by a damp towel. Freeze for up to 3 months. When ready to bake, thaw in the fridge overnight, then proceed with scoring and baking as usual.
This method lets you prep ahead for spontaneous baking days. ❄️
Baked Bread Storage
Cool your bread completely on a wire rack, then wrap it in a clean kitchen towel and store at room temperature for 2 days. For longer storage, slice and freeze individual portions in airtight bags for 3 months.
Reheat slices in a 350°F oven for 5 minutes to restore freshness. 💡
Starter Maintenance
Keep your active starter alive between batches by storing it in a glass jar with a loose lid at room temperature. Feed it equal parts flour and water every 7 days—this maintains its vitality without requiring daily attention. A healthy starter is the foundation of great sourdough! 🔄
Nutrition facts
Frequently asked questions
How do I know when my sourdough starter is ready for baking?
Your starter should be bubbly, domed, and have a pleasingly tangy aroma—like yogurt or vinegar. It should also float in water when dropped in a glass. For this recipe, it needs to be 100% hydration and active after a 12-hour feed the night before. If it smells like alcohol or has a grayish tint, feed it again with fresh flour and water.
Can I use this recipe without a Dutch oven?
Yes, but your crust may be less crispy. Use a heavy oven-safe pot with a lid instead, or bake on a baking sheet with a metal bowl inverted over the loaf during the first 20 minutes to create steam. For best results, preheat the substitute container in the oven for 45 minutes before baking.
Why did my bread turn out dense instead of airy?
Dense bread usually results from underproofing or over-kneading. Ensure your dough ferments for the full 4-8 hours at 70-75°F and cold proofs for 12-16 hours. Avoid kneading longer than 10 minutes—folding is gentler. Also, check your starter's activity before mixing.
How can I make this recipe gluten-free?
This recipe isn't designed for gluten-free flours, but you can attempt it with a 1:1 gluten-free bread flour blend (like King Arthur's) plus 1 tbsp xanthan gum. Expect a denser texture and less oven spring. The hydration ratio may need adjustment—start with 1.5 cups water instead of 1.75 cups and monitor dough consistency.
What's the best way to revive stale sourdough?
Slice the bread and reheat in a 350°F oven for 5-10 minutes wrapped in foil with a ½ cup water in the pan to create steam. For extra crispiness, broil for 1-2 minutes after reheating. Alternatively, toast slices in a dry pan over medium heat for 2 minutes per side.