Sourdough French Toast That Finally Justified Waking Up at 7am
Mary Claire LangstonSourdough French toast transforms stale bread into something worth setting an alarm for. The tangy crumb soaks up custard without falling apart. That natural fermentation creates crispy, caramelized edges while keeping the center soft and custardy—something regular bread just can't pull off. I've made this every weekend for three months straight, and I'm still not tired of it.
TL;DR: Sourdough French toast uses your discard starter as a natural flavor booster in the egg custard. The result is richer, tangier, and more complex than regular French toast — and it uses up starter
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Sourdough French toast uses your discard starter as a natural flavor booster in the egg custard. The result is richer, tangier, and more complex than regular French toast — and it uses up starter you'd otherwise throw away. Takes 15 minutes total.
It was 7 AM on a Sunday. I had half a jar of sourdough discard sitting on the counter — too much to toss, not enough to bake a loaf.
My daughter wanted French toast.
So I put the two together. And what came out of that pan changed how I make French toast permanently.
Not because it was clever. Because it was better. Noticeably, undeniably better — with a depth of flavor that regular eggs-and-milk custard just doesn't have. The tang from the starter cuts through the sweetness of the maple syrup. The bread absorbs deeper. The edges get this slightly caramelized crispness that stays even after it sits on the plate.
My daughter asked for it again the next weekend.
And the weekend after that.
Now it's the only French toast I make.
Why Sourdough Discard Makes Better French Toast
Regular French toast custard is eggs, milk, a little vanilla, maybe some cinnamon. It works. It's fine.
Add sourdough discard and three things happen:
- The flavor deepens. Discard has natural acidity and fermented complexity — the same thing that makes sourdough bread taste better than plain white bread. That same quality translates to the custard.
- The texture gets richer. The starter adds a slight thickness that helps the custard cling to the bread instead of just soaking in and making it soggy.
- You waste nothing. Every tablespoon of discard you'd normally throw away gets turned into breakfast instead.
It doesn't taste sour. Not at all. The sweetness and maple balance it. What you taste is complexity — the thing that makes food memorable instead of just filling.
Sourdough French Toast Recipe
Ingredients (serves 2–3)
- 4–6 thick slices of bread — brioche, sourdough, challah, or day-old sandwich bread
- 3 large eggs
- ¼ cup sourdough discard (unfed, straight from the fridge is fine)
- ⅓ cup whole milk or half-and-half
- 1 tablespoon maple syrup (plus more for serving)
- 1 teaspoon vanilla extract
- ½ teaspoon cinnamon
- Pinch of salt
- 2 tablespoons butter for the pan
How to Make It
Step 1: Make the custard. Whisk together eggs, discard, milk, maple syrup, vanilla, cinnamon, and salt in a shallow bowl wide enough to dip your bread. Whisk until the discard is fully incorporated — no lumps. It should look slightly thicker than regular French toast custard. That's the discard doing its job.
Step 2: Soak the bread. Dip each slice in the custard for 20–30 seconds per side. You want it saturated but not falling apart. Thick-cut bread handles this better than thin slices — another reason brioche or day-old sourdough works so well here.
Step 3: Cook it right. Melt butter in a heavy skillet or cast iron pan over medium heat. When the butter is foamy but not brown, add the bread. Don't crowd the pan.
Cook 3–4 minutes per side without touching it. You want a deep golden-brown crust — not pale, not dark. The internal temperature should hit around 160°F if you want to be exact about it, but the color tells you everything you need to know.
Step 4: Serve immediately. Sourdough French toast is best the moment it comes out of the pan. Top with fresh berries, a drizzle of real maple syrup, and powdered sugar if you have it.
That's it. Fifteen minutes, start to finish.
Variations Worth Trying
The Overnight Version
Make the custard the night before. Soak the bread slices in a baking dish, cover, and refrigerate overnight. The bread absorbs more deeply, the flavors intensify, and in the morning you just pull it out and cook. Best version of this recipe. Takes 3 minutes of active work the night before.
The Baked Version (Feeds a Crowd)
Pour the custard over bread cubes in a greased 9x13 baking dish. Cover and refrigerate overnight. Bake at 350°F for 35–40 minutes until puffed and golden. Serves 6–8. Perfect for when you have people over and don't want to stand at a stove making individual portions.
Sourdough Discard Stuffed French Toast
Cut thick brioche slices and make a pocket in each. Fill with 2 tablespoons of cream cheese mixed with a teaspoon of jam or fresh berries. Pinch the edges to seal, then soak and cook as normal. The filling melts into something that tastes like a baked pastry. Worth the extra 5 minutes of effort.
Which Bread Works Best
| Bread | Result | Best For |
|---|---|---|
| Brioche | Rich, buttery, ultra-custardy | Special occasions, company |
| Sourdough loaf | Tangy, sturdy, crisp edges | When you have leftover bread |
| Challah | Soft, slightly sweet, holds shape | Kids, picky eaters |
| Day-old sandwich bread | Absorbs deeply, affordable | Weekday mornings |
| Texas toast | Thick, hearty, filling | Big appetites |
One rule: day-old bread is better than fresh. Fresh bread is too soft and turns to mush when soaked. A day-old slice has dried out just enough to absorb the custard without falling apart.
And if you skip the 14-day build, get a free established culture by mail — free with just $4.95 shipping.
Frequently Asked Questions
Can I use unfed sourdough discard for French toast?
Yes. Unfed discard straight from the fridge works perfectly. You're not relying on it to leaven anything here — you just want its flavor and thickness. Active starter works too, but there's no advantage over discard for this recipe.
How much discard do I use per batch?
¼ cup (about 60 grams) per 3 eggs is the right ratio. More than that and the batter gets too thick and the tang becomes noticeable. Less and you won't taste the difference from regular French toast.
Does sourdough French toast taste sour?
No. The sweetness from maple syrup and vanilla balances it completely. What you taste is depth and complexity, not sourness. Most people can't identify what makes it better — they just know it is.
Can I make sourdough French toast without sourdough bread?
Yes — the discard goes into the custard, not the bread. You can use any bread you like. Brioche is the most popular choice. The sourdough flavor comes from the starter in the egg mixture, not the bread itself.
How do I store leftover sourdough French toast?
Refrigerate up to 3 days. Reheat in a dry skillet over medium heat for 2 minutes per side — not the microwave, which makes it soggy. It reheats surprisingly well and makes a fast weekday breakfast.
What if I don't have a sourdough starter yet?
You need one. Every recipe on this site gets better with a live culture in your fridge. The Mother — our 288 year old heritage starter — is the best place to start. It's free. You just cover postage.
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Written by
Mary Claire Langston
Mary Claire has been baking sourdough for 30+ years and trained at the Tennessee Culinary Institute. She inherited her grandmother's 50-year-old starter in 2019. She feeds it every morning before her coffee gets cold.
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