Oat sourdough bread starts with a step most recipes skip: toasting the oats in a dry pan before they ever touch the dough. Five minutes over medium heat and they smell nutty and faintly sweet, closer to popcorn than to oatmeal. This is our everyday whole grain sourdough bread with that one addition, and it changes the whole loaf.

Oat sourdough bread with a scored, flour-dusted crust and a deep golden ear on a wooden board

Oat Sourdough Bread with Toasted Oats

Oat sourdough bread built on a soaker of dry-toasted oats: our everyday whole grain loaf, nutty and faintly popcorn-sweet, with a soft crumb and crackly crust.

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Prep Time 40

Cook Time 35

Soaking & Proofing 20

Total Time 21 15

Servings: 1 loaf

Course: Bread, Breakfast, Side Dish

Cuisine: Nordic, Norwegian, Scandinavian

Ingredients Equipment Method Notes

Ingredients

Toasted oat soaker

50 g rolled oats generous ½ cup; old-fashioned rolled oats, not instant
150 g boiling water ⅔ cup

Starter

140 g active sourdough starter about ⅔ cup — bubbly, doubled and at its peak

Dough

400 g water 1 ⅔ cups, lukewarm
300 g bread flour about 2½ cups — or sifted landhvete if you're in Scandinavia
150 g whole wheat flour about 1¼ cups — or fine wholemeal landhvete
100 g coarse stone-ground whole wheat flour a scant 1 cup — or coarse wholemeal landhvete
15 g fine sea salt 2½ tsp

For the basket

20 g rice flour a few tablespoons, for dusting — resists sticking far better than wheat flour

Equipment

Digital kitchen scale We bake everything by weight; it's the difference between a good loaf and a lucky one.
Cast iron or heavy stainless skillet For dry-toasting the oats. A pan that holds steady heat colors them evenly instead of scorching
Bench scraper Makes handling sticky, high-hydration dough far easier.
proofing basket (banneton) Holds the dough's shape through the overnight rise and gives that beautiful spiral pattern.
Linen cloth (couche) Lines the basket so the dough releases cleanly and keeps a crisp pattern.
Bread lame or scoring knife For one clean, confident scoring cut.
Perforated baking sheet Lets heat reach the base so the bottom crust sets properly. Preheat it with the oven.
Metal roasting tray Your steam source on the rack below. Metal only, never glass.
Instant-read thermometer The one honest doneness check: 205–210°F (96–99°C) in the center. The oats darken the crust early, so color alone can fool you.
Wire cooling rack The loaf needs air underneath while the crumb sets.

Method

The oat soaker — make this first

Toast the oats dry. Put the rolled oats in a dry skillet over medium heat. Stir or shake the pan every 20–30 seconds and keep going for 5–7 minutes, until they turn a shade darker and smell like popcorn. That smell is your cue — it's the whole point of the recipe.
Scald them. Tip the hot oats into a bowl and pour the boiling water over. Stir once, cover, and leave for 1 hour. They'll swell into a thick, loose porridge and cool to roughly room temperature.

Day 1

Feed your starter the morning you bake (or the night before) so it's lively when you mix — it should have roughly doubled and look domed and bubbly. A spoonful floating in water is a good extra sign, but a whole grain starter can sink even when it's ready, so trust the rise first.
Mix the dough. In a large bowl, whisk the starter into the lukewarm water to loosen it. Add all three flours and mix by hand until no dry flour remains — you'll have a shaggy, sticky dough. Hold the salt and the soaker back for now. Cover and rest 1 hour at room temperature.
Add the salt and the soaker. Sprinkle the salt over the dough and add the whole oat soaker, including any liquid still in the bowl. Squeeze and fold until both are fully worked in. The dough will feel looser than before the oats went in — that's expected.
Stretch and fold — every 30 minutes, at least 4 times. With a wet hand, grab one side of the dough, stretch it up, and fold it over the center; turn the bowl a quarter turn and repeat around the whole dough (four pulls = one set). Cover, rest 30 minutes, repeat. Over these 2 hours the dough goes from slack and shaggy to smooth, elastic, and airy. Our Stretch & Fold Timer keeps track of the sets for you.
Bulk ferment until risen. After the folds, cover and let it rise at room temperature until it's grown by about 30–50%, looks domed and jiggly, and shows bubbles on top and along the sides. Depending on your kitchen this is roughly 4–6 hours total from mixing — warmer is faster, cooler is slower, and whole grain dough runs a little quicker than white. Watch the dough, not the clock; our guide to bulk fermentation shows you what to look for.
Preshape and shape. Tip the dough onto a lightly floured surface and gently round it into a loose ball. Leave it uncovered for 20–30 minutes so the gluten relaxes. Then fold it into a taut round (or oval), pulling it toward you against the counter a few times to build surface tension — more on that in how to shape sourdough. Dust the shaped dough with rice flour; it resists sticking far better than wheat flour and gives the cleanest release.
Into the banneton. Line your proofing basket with a cloth and dust it generously with rice flour, then set the dough in seam-side up. The cloth and rice flour together are what stop the dough from sticking to the basket.
Cold retard overnight. Cover and refrigerate 12–16 hours. The slow, cold rise builds flavor and firms the dough so it's easier to score and springs higher in the oven.

Day 2 — bake

Preheat, hot. About 45–60 minutes before baking, heat the oven as hot as it goes — around 480°F (250°C) — with two trays inside: your perforated baking tray (or a regular baking sheet) on the middle rack, and an empty metal roasting tray on the rack below. The baking tray needs to be properly hot before the loaf lands on it; the roasting tray is what makes your steam. Both metal, never glass — glass can shatter when the water hits it.
Turn out and score. Turn the cold dough out onto a sheet of parchment, seam-side down. Score the top with one confident slash using a bread lame or sharp blade — this controls where the loaf opens up. See how to score sourdough for angle and depth.
Bake with steam. Slide the loaf, still on its parchment, onto the hot baking tray on the middle rack — parchment and all, in one quick movement. Immediately pour about 1 cup of just-boiled water into the hot tray below (stand back — it steams up fast) and shut the door quickly to trap it. Bake at 480°F (250°C) for 20 minutes.
Finish in dry heat. After 20 minutes, take the roasting tray out, drop the oven to 400°F (200°C), and bake another 15 minutes until deeply golden. Start checking at 10 minutes — the oats add a little sugar to the crust, so it colors faster than the plain loaf. To be sure it's done, the loaf should sound hollow when tapped and read 205–210°F (96–99°C) in the center. Our guide to sourdough baking temperature explains the heat and steam in detail.
Cool completely. Lift it out and cool on a wire rack for at least 2 hours before slicing. Cutting too early makes the crumb gummy — this last wait matters.

Notes

Chef’s tip — toast the oats until they smell like popcorn. That smell is the cue, and it’s the single thing that makes this loaf different from our whole grain original. Five minutes in a dry pan, then straight into the boiling water — the scald softens the oats so they hydrate from the bowl instead of stealing water from the dough.

Add the soaker with the salt, not at the first mix. The oats need that hour to cool, and the base dough builds better gluten without a soft, wet inclusion getting in the way.

Weigh, don’t scoop. A digital scale is the single biggest upgrade for consistent sourdough; the cup measures above are approximate.

Slacker than the plain loaf. The soaker brings its own water, so this dough feels looser than our whole grain bread. If it’s unmanageable in your kitchen, hold back 25 g of the main water on the first mix and add it during the folds if the dough will take it.

Got a Dutch oven? You can bake covered instead: lower the loaf into a screaming-hot pot, lid on, 20 minutes at 480°F (250°C), then lid off at 400°F (200°C) for the last 15 — no water tray needed.

Rice flour is the trick for proofing baskets — it doesn’t absorb into the dough the way wheat flour does, so the loaf lifts out cleanly and keeps a crisp pattern. It matters even more with a wetter dough like this one.

Why dry-toast the oats first

Raw oats stirred into bread dough taste like what they are: mild, soft, a little flat. Toasting them changes the flavor completely. The heat browns the starches and the oat’s own fat, and what you get is nutty and almost popcorn-sweet — a flavor that holds up through a long fermentation and a hard bake.

Toast them in a dry pan over medium heat, moving them every 20–30 seconds. When they turn a shade darker and you can smell popcorn, they’re done. That smell is the whole cue. Pull them before they go bitter.

Then pour boiling water over them and leave them for an hour. This is a soaker, and it matters: pre-hydrated oats take their water from the bowl instead of stealing it from your dough. Skip the scald and the oats pull moisture out of the crumb while it bakes, and you end up with a drier loaf than you started with.

Working with a wetter dough

Everything else about this loaf is exactly our whole grain method — same flours, same folds, same overnight rise, same bake. The only difference you’ll feel is the soaker’s water, which makes the dough slacker than the plain version. It should be — sourdough hydration explained covers why. Wet one hand before each stretch and fold, use a bench scraper instead of fighting it with your fingers, and trust that the first two folds will feel worse than the last two. By the fourth it will be smooth and holding shape.

Don’t expect a wide-open, high-hydration crumb from this one — oats bring moisture and soften the gluten network. What you get is an even, irregular structure with plenty of small and medium holes, and a crumb that stays soft for days. It makes a genuinely good sandwich, which a very open loaf never quite does.

One thing to watch in the oven: the oats add a little sugar to the crust, so it browns faster. Start checking at 10 minutes into the second stage rather than waiting out the full 15.

Sliced oat sourdough bread showing a soft, even crumb flecked with toasted oats

Storing Oat Sourdough Bread

Cut side down on a board, no plastic, at room temperature. From day two, a linen bread bag keeps the crumb moist while the crust stays dry. The soaker keeps this loaf soft a day or two longer than the plain whole grain bread — good for three days, still fine on the fourth.

For longer than that, slice it and freeze it in a bag; slices toast straight from the freezer. When the last of it goes firm, our leftover sourdough ideas put it to work.

Make it your own

Try it on the beginner loaf. The soaker works exactly the same way in our beginner sourdough bread — toast, scald, rest an hour, add it with the salt. It’s the easiest upgrade in this whole method.
Seeded version: add 30 g of sunflower or flax seeds to the soaker along with the oats. Same boiling water, same hour.
Rye and oats: swap the coarse whole wheat for 100 g coarse rye. Earthier, denser, excellent with cheese — and a step toward our Danish rye bread.
Oats on the crust: brush the shaped loaf with water and press toasted oats onto the top before it goes into the basket. Flavor-wise it adds little, but it reads clearly as an oat loaf when you slice it.

Oat Sourdough Bread with Toasted Oats