America's Test Kitchen Irish Soda Bread Recipe: Buttery Crumb and Tangy Vinegar Crunch

America’s Test Kitchen’s foolproof Irish soda bread recipe delivers that perfect balance of tangy vinegar crunch and buttery crumb. I've tested countless variations, and this recipe captures the essence of the classic—simple ingredients, no-knead method, and that signature crusty exterior hiding a tender interior.

The secret lies in the baking soda for lift and the vinegar for tang, creating a flavor profile that's both rustic and refined.

What sets this recipe apart is the cast-iron skillet technique, which ensures an even bake and that coveted crispy crust. No yeast means no waiting for dough to rise, just mix, shape, and bake in 45 minutes—ideal for a quick side dish or hearty snack.

The buttermilk adds richness, while the vinegar keeps the texture light and slightly crisp. It’s the kind of bread that pairs perfectly with soups, stews, or simply slathered with butter.

This version stays true to tradition while offering flexibility—add seeds for texture or herbs for extra flavor without compromising the classic taste. The foolproof method ensures consistent results every time, whether you're baking for a crowd or treating yourself to a warm slice.

The aroma alone will have everyone asking for seconds before it even hits the table.

Perfect for meal prep, gifting, or enjoying fresh from the oven, this Irish soda bread is a game-changer for any kitchen. Let’s get started on creating your own batch—no yeast, no fuss, just pure, satisfying flavor.

The crust will crackle, the crumb will be tender, and every bite will taste like a taste of Ireland.

Ingredients for america's test kitchen irish soda bread

Eight simple ingredients transform into rustic Irish soda bread with crispy crust and tender crumb.

The flour is the foundation—King Arthur or Bob's Red Mill all-purpose works best for that signature texture. Baking soda must be fresh (test with vinegar: if it fizzes vigorously, it's good). For the buttermilk, Cultivate brand from the dairy aisle is my go-to, but homemade (milk + vinegar) works perfectly. The oat flakes add rustic texture—skip if you prefer a smoother crumb. Preheat your cast-iron skillet while mixing; this ensures an even bake and that coveted crispy crust.

No buttermilk? Mix 1.5 tbsp vinegar with 1.5 cups milk and let sit 5 minutes. Swap poppy seeds for sesame or flaxseeds if preferred. The vinegar can be apple cider vinegar for a milder tang. For extra flavor, add 1 tsp dried rosemary or thyme to the dough. The butter should be cold—softened but not melted—for optimal flakiness. If your flour lacks protein, add 1 tbsp vital wheat gluten for better structure.

Store wrapped in a clean kitchen towel at room temperature for 3-4 days or freeze for 3 months. Reheat slices in a 200°F oven for 5 minutes to restore freshness. The bread improves overnight as the crumb softens. For gifting, wrap in parchment and tie with twine—it makes a stunning presentation. Slice with a serrated knife for clean cuts, and always serve warm with extra butter.

Step-by-step instructions for america's test kitchen Irish soda bread

This method delivers a perfectly textured loaf with a crisp crust and tender crumb every time.

In a large mixing bowl, whisk together the 4 cups all-purpose flour, 1 tablespoon baking soda, 1 teaspoon salt, and 0.5 cup oat flakes. This dry combination ensures even distribution of leavening and texture throughout the bread. Use a whisk for 30 seconds to break up any flour clumps, especially around the baking soda.

I like to press the baking soda into the flour with my fingers to prevent large pockets that could create uneven rising. The oat flakes will add subtle texture, but make sure they're evenly distributed so every bite has that pleasant crunch.

In a separate bowl, combine the 1.5 cups buttermilk with 1 tablespoon white vinegar. Stir well and let the mixture sit for 5 minutes until it thickens slightly. This reaction between the acid and buttermilk creates the perfect tangy foundation for the bread's flavor profile.

While waiting, warm the 0.25 cup milk in a small saucepan over low heat until it reaches 110°F—just warm enough to melt the butter easily. The warm milk helps incorporate the cold butter more smoothly into the dough, preventing it from creating lumps.

Add the buttermilk-vinegar mixture to the dry ingredients and stir with a wooden spoon until just combined. The dough will be shaggy and sticky at this stage—that's normal. Then cut the 0.5 cup unsalted butter into small cubes and add them to the dough.

Using your hands, gently work the butter into the dough until it forms a soft, slightly tacky mass. You should be able to gather it into a loose ball without it sticking excessively to your fingers. If the dough feels too dry, add 1 tablespoon of the warm milk at a time until it reaches the right consistency.

Transfer the dough to a lightly floured surface and shape it into a round loaf about 8 inches in diameter. I press down gently in the center to create a slight well—this helps create the classic soda bread cross pattern. Sprinkle the 2 tablespoons poppy seeds evenly over the top.

Place the loaf on a parchment-lined baking sheet. Use a sharp serrated knife to cut a deep cross on top, about ½ inch deep. This not only creates the traditional look but also helps the bread bake evenly. Let the loaf rest for 10 minutes while you preheat the oven to 375°F.

Bake the bread for 45-50 minutes until it's deep golden brown and sounds hollow when tapped on the bottom. The internal temperature should reach 190°F at the center. The crust should be crisp while the interior remains tender with a slightly dense crumb.

For best results, avoid opening the oven door during baking. The sudden temperature change can cause the bread to collapse. When done, transfer the loaf to a wire rack and let it cool for 15 minutes before slicing. The bread will continue to firm up as it cools, making it easier to slice cleanly.

Troubleshooting this dish

Dough Too Sticky

If your dough feels excessively sticky, resist the urge to add more flour—this disrupts the gluten structure. Instead, wet your hands slightly with water and gently shape the dough.

The 1.5 cups buttermilk and 0.25 cup milk should provide enough moisture, but if needed, add 1 tablespoon warm milk at a time until it becomes manageable. I find that using a lightly oiled dough scraper helps gather the dough without sticking.

Uneven Rising

Uneven rising often happens when baking soda isn’t evenly distributed. Whisk the dry ingredients thoroughly, then press the baking soda into the flour with your fingers to eliminate clumps. If your bread rises unevenly, the dough may have been too dry—add 1 tablespoon warm milk and reshape gently.

Preheating your cast-iron skillet to 375°F ensures even heat distribution for consistent baking.

Dense Crumb

A dense crumb usually means overmixing or insufficient leavening. Stir the wet ingredients into the dry just until combined—overmixing develops gluten, making the bread tough. Ensure your baking soda is fresh (test with vinegar: it should fizz vigorously).

If your bread still feels dense, try adding 1 extra tablespoon baking soda next time, but don’t exceed 1.5 tablespoons total.

Pale Crust

A pale crust indicates underbaking or insufficient heat. Always bake until the bread reaches 190°F internally and sounds hollow when tapped. If your oven runs hot, reduce the temperature to 350°F and bake for 5-10 minutes longer.

For extra crust color, brush the loaf with melted butter after baking and return it to the oven for 2-3 minutes.

Cracked but Not Cross-Shaped

If your bread cracks randomly instead of forming a clean cross, your knife wasn’t sharp enough or the cut wasn’t deep enough. Use a serrated knife and press down firmly to create a ½-inch-deep cross.

The cut should go all the way through the center well you created earlier. This helps the bread expand evenly and prevents jagged cracks.

Crumb Too Dry

Dry crumb often results from overbaking or using too much flour. To fix this, reduce baking time slightly next time and check the internal temperature at 40 minutes. If your dough feels dry while mixing, add 1 tablespoon warm milk at a time until it’s just tacky.

For extra moisture, brush the baked loaf with melted butter while still warm.

Frequently asked questions