Artisan Sourdough Bread Recipe King Arthur: Foil-Sealed Crust and Tangy Depth in One Loaf

This artisan sourdough bread recipe using King Arthur flour delivers restaurant-quality results with a foil-sealed crust and tangy depth in every slice. The high-protein flour creates that signature open crumb structure while maintaining perfect hydration control—no more dense, gummy loaves.

I’ve perfected this method after years of baking failures, and the key lies in precise fermentation timing and oven spring techniques that work every time.

The process begins with your starter, which should be active and bubbly before mixing. We’ll use a long bulk fermentation (8-12 hours) to develop maximum flavor, followed by a shaped proof that gives the dough its signature oven spring.

King Arthur’s flour helps maintain structure even with higher hydration levels, preventing overproofing while delivering that classic sourdough tang. The foil-sealed crust creates a crispy exterior without drying out the interior.

What you’ll end up with is a loaf that’s perfect for sandwiches, toast, or serving alongside soups—crusty on the outside, open and airy inside, with that unmistakable sourdough flavor.

The recipe includes troubleshooting tips for common issues like weak oven spring or dense crumb, so even beginners can achieve professional results. This is the kind of bread that makes you feel like a true artisan baker.

Ready in about 24 hours (including fermentation), this recipe transforms simple ingredients into something extraordinary. Whether you’re a seasoned baker or just starting, the step-by-step instructions will guide you through every phase—from starter maintenance to scoring that beautiful crust. Let’s get started on your first perfect loaf.

Ingredients for artisan sourdough bread recipe king arthur

Four cups flour plus your active starter—this is where artisan magic begins.

King Arthur’s high-protein flour is non-negotiable here. Bulk bins at Whole Foods or the 5-pound bag from King Arthur work best—the protein content is what gives you that open crumb structure. Your starter needs to be 100% hydration and bubbly—if it’s sluggish, feed it 1:1:1 (flour:water:starter) 4-6 hours before mixing. Room temperature water is critical; cold water slows fermentation, and hot water can kill your yeast. For the olive oil, California Avocado Ranch or Colavita add subtle fruitiness that pairs perfectly with sourdough. If you don’t have a baking stone, a preheated Dutch oven with a lid works just as well for that steamy environment.

No razor blade? A sharp serrated knife works in a pinch, but the clean cut matters for even oven spring. Running short on cornmeal? Semolina flour is the next best thing—it’s got that same gritty texture. The foil sealing is what creates that crispy crust without drying out the interior, so don’t skip it. If your kitchen gets too warm during bulk fermentation, place the bowl on ice cubes to slow the rise slightly. For scoring, practice makes perfect—aim for a 1/4-inch deep cut at a 45-degree angle. The extra flour for dusting isn’t just for preventing sticking; it creates that beautiful crumb you’re after.

This dough is a marathon, not a sprint. Bulk fermentation takes 8-12 hours—set a timer so you don’t overproof. The shaped proof should take about 1-2 hours at room temp. Store your starter in the fridge between uses, feeding it once a week to keep it alive. The baking stone needs at least 1 hour to preheat—don’t rush this. Leftovers? Toast within 2 days for best texture. Freeze slices wrapped in parchment for up to 3 months—just reheat in a toaster or oven to restore crispiness.

Step-by-step instructions for artisan sourdough bread with foil-sealed crust

Master this technique and you'll achieve bakery-quality sourdough with a crisp crust and open crumb every time.

In a large mixing bowl, combine the 4 cups King Arthur Bread Flour and the 1 cup Active Sourdough Starter. Add the 2.5 cups Water and mix with a wooden spoon until just combined—you should see a shaggy mass with no dry flour remaining. This initial mix is called an autolyse, and it allows the flour to fully hydrate and develop gluten.

Cover the bowl with plastic wrap and let the dough rest for 30 minutes. During this time, the flour will absorb the water and begin developing structure. You'll notice the dough becomes smoother and more pliable. This step is crucial for creating that signature open crumb structure in sourdough.

After the autolyse, sprinkle the 1.5 tsp Sea Salt and 1 tbsp Olive Oil over the dough. Using your hands, gently work the salt and oil into the dough until fully incorporated. This is where the magic happens—we're going to develop the gluten through a series of stretches and folds.

Wet your hands to prevent sticking, then 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, then fold it over itself. Rotate the bowl and repeat this process on all four sides. You're building gluten structure that will give your bread its chewy texture and ability to trap gases for that perfect rise.

After the final stretch-and-fold, let the dough rest at room temperature for 1 hour. Then, transfer it to the refrigerator and chill for 12-16 hours. This cold fermentation slows yeast activity, allowing flavors to develop and gluten to relax. The dough should nearly double in size during this time, with small bubbles forming on the surface.

Here's where the ice cubes come in: just before shaping, remove the dough from the fridge and place it on your work surface. Add the 4 pieces Ice Cubes around the dough to help chill it quickly while you work. This prevents the dough from warming up too much during handling, which can cause over-proofing. The cold dough will be easier to shape and hold its structure during the final proof.

Lightly dust your work surface with the 0.5 cup King Arthur Bread Flour. Shape the chilled dough into a tight boule by pulling the edges toward the center and tucking them underneath. This creates surface tension that helps the bread hold its shape during baking. Place the shaped dough seam-side up on the parchment paper.

Cover the dough with a damp towel and let it proof at room temperature for 1-2 hours, until it has risen by about 50%. You'll know it's ready when the dough springs back slowly when poked with a finger—it should leave a slight indentation but not bounce back immediately. This final proof develops the gas bubbles that create that beautiful open crumb structure.

Preheat your baking stone to 475°F for at least 1 hour. When ready, transfer the proofed dough onto the parchment paper. Using the razor blade, score the dough by making a deep, confident cut down the center. This controlled cut directs the oven spring and creates that beautiful ear on top.

Bake the bread for 20 minutes uncovered, then tent with the aluminum foil to trap steam. This creates that signature crisp crust while keeping the interior moist. After 20 minutes, remove the foil and bake for another 15-20 minutes until the crust is deep golden brown. You'll know it's done when the internal temperature reaches 205°F and the crust sounds hollow when tapped.

Remove the bread from the oven and transfer it to a wire rack. Let it cool completely before slicing—this allows the crumb to set properly. The bread should have a crisp exterior with a shatteringly crisp crust from the foil sealing technique, and an open, airy crumb with those characteristic tangy sourdough flavors.

Slice and serve warm, preferably the same day. The flavor will continue to develop over the next 24 hours as the dough ferments further, but it's best enjoyed fresh from the oven when the crust is at its crispiest. This method delivers that perfect balance of tangy depth and crisp crust that makes artisan sourdough worth the effort.

Creative variations of this dish

Herb-Infused Variations

Add 1 tbsp fresh rosemary or thyme to the dough during the final stretch-and-fold for an aromatic twist. I like using Penzeys Spices for dried herbs if fresh isn't available. The herbs infuse beautifully during bulk fermentation, adding earthy notes that pair perfectly with the tangy sourdough.

For a stronger flavor, increase to 2 tbsp but reduce olive oil slightly to ½ tbsp to maintain dough balance. 🌿

Seeded Crust Options

Mix 2 tbsp sesame seeds or 1 tbsp poppy seeds into the final ½ cup flour you use for dusting the boule. The seeds will stick to the crust during baking, creating a decorative and textural contrast.