Sourdough Croutons Recipe (Oven, Pan, or Air Fryer)

Sourdough croutons are the most overlooked recipe in any home baker's repertoire. You take a few slices of stale sourdough you'd otherwise bin, dress them with olive oil and seasoning, roast them slowly, and end up with something genuinely better than the shop-bought stuff costing £3 a tub. They keep for weeks, transform a soup or salad in one step, and use up the staling ends of every loaf.

The recipe

Ingredient	Quantity
Stale sourdough bread (2–4 days old, not too stale to slice)	250g
Extra virgin olive oil	4 tablespoons
Fine sea salt	1 teaspoon
Freshly ground black pepper	½ teaspoon
Garlic powder	½ teaspoon
Optional flavourings (see below)	—

Makes about 350g of croutons — enough for 4–6 servings of soup, or 6–8 salads.

The crouton secret: low and slow

Most crouton recipes online tell you to bake at 200°C for 10 minutes. The result is a hot exterior and a slightly damp middle that goes soggy within hours. The proper method is the opposite: 160°C for 25–30 minutes. Low heat dries the bread through, drives out the moisture entirely, and produces croutons that stay crisp for weeks.

This is also how restaurant croutons stay good. Slow roasting concentrates flavour, develops crunch through, and gives you that ideal balance of crisp shell and tender (but not damp) centre.

Method

1. Cut the bread

Cut your sourdough into 2cm cubes. Don't be too uniform — irregular shapes give better texture variety. Crusts can be left on; they make the best croutons.

2. Toss with oil and seasoning

In a large bowl, drizzle the oil over the cubes. Toss to coat — every cube should glisten lightly. Sprinkle on the salt, pepper, and garlic powder. Toss again. The oil and seasoning should distribute evenly.

3. Spread on a tray

Tip onto a large baking tray. Spread in a single layer, with space between cubes. Crowding leads to steaming, not crisping.

4. Bake low and slow

160°C (fan), 25–30 minutes. Stir once at the 15-minute mark to redistribute the cubes.

The croutons are done when:

• They sound hollow when tapped on the tray.
• They're a deep golden brown all over.
• One snapped in half is dry through, with no chewy moisture.

5. Cool and store

Cool completely on the tray. They crisp further as they cool. Store in an airtight container at room temperature for up to 3 weeks.

Flavour variations

Parmesan and herbs

After the oil-toss but before baking, toss with 30g finely grated parmesan and 1 tablespoon dried Italian herbs (oregano, thyme, basil). Cheesy, deeply savoury, restaurant-quality.

Smoky paprika

Add 1 teaspoon smoked paprika and ½ teaspoon ground cumin. Excellent on tomato soup or with chorizo.

Lemon and rosemary

Replace the garlic powder with the zest of 1 lemon and 1 tablespoon finely chopped fresh rosemary. Light, bright, perfect for green salads.

Garlic-confit

Replace olive oil with garlic-infused olive oil (oil that's been gently cooked with garlic cloves for 30 minutes). Adds depth without burning the garlic.

Truffle

Add 1 teaspoon of truffle oil to the toss-mix at the end. Save these croutons for special occasions.

Sweet (cinnamon-sugar)

Toss with 30g caster sugar and 2 teaspoons ground cinnamon instead of salt and pepper. Use butter instead of olive oil. Bake the same way. Brilliant on stewed fruit or yoghurt — like proper homemade granola.

Three croutons for three uses

Different soups and salads want different croutons. The size and seasoning should match what they're going on:

For Caesar salad

Large cubes (2.5cm), parmesan and garlic, deeply golden. The croutons should be a substantial component of the salad, not a sprinkling.

For tomato soup

Medium cubes (1.5cm), smoky paprika or plain. They float and absorb a little broth without going soggy.

For mixed leaves

Small cubes (1cm), lemon and herb, lightly browned. Add at the last moment so they stay crisp.

What kind of bread works best

Your own sourdough is the best — the open crumb gives you crispy ridges and pockets that absorb dressing well. Stale sourdough that's too hard to slice for sandwiches is perfect; the slight dryness saves you a step.

Other breads that work:

• Wholemeal sourdough — denser, nuttier croutons.
• Olive sourdough — already flavoured, just add salt.
• Baguette — produces classic French-style croutons.
• Ciabatta — slightly oilier, more open texture.

Avoid:

• Soft sandwich bread — falls apart, doesn't crisp properly.
• Brioche — too rich, burns easily.
• Rye bread — works for some uses (like with herring) but distinctive flavour.

The pan-fried alternative

If you only have 5 minutes and 50g of bread, you can pan-fry instead of oven-bake. Heat 2 tablespoons of olive oil in a frying pan over medium-high heat. Add the bread cubes. Stir constantly for 4–5 minutes until they're golden and crisp. Season after frying.

Pan-fried croutons are slightly crispier and absorbent more oil, so they're rich. They're best eaten the day they're made — they soften within 24 hours.

The salad upgrade in 10 seconds

The single most useful kitchen tip we've learnt: keep a jar of sourdough croutons in the cupboard at all times. A handful turns any green salad into a proper meal. Add to:

• Caesar salad — the classic.
• Roasted vegetable salad — soaks up the dressing.
• Tomato and basil — provides the carb dimension.
• Goat's cheese and beetroot — texture contrast.
• Greek salad — replaces the bread you'd serve alongside.

10 seconds of work for a 10x improvement to a tired weekday salad.

Sweet variations: croutons as breakfast

The cinnamon-sugar version is a revelation. Toss bread cubes with melted butter, caster sugar, cinnamon, and a pinch of salt. Bake at 160°C for 20 minutes. Stir into Greek yoghurt with stewed apple, scattered over a fruit crumble, sprinkled on porridge with maple syrup. Tastes like proper homemade granola but takes 20 minutes.

Common problems

Croutons stay chewy in the middle: bread was too fresh, or oven too hot for too short a time. Use older bread, or extend the bake by 10 minutes at lower heat.

Croutons burnt before crisp: oven too hot, or oil pooled on tray. Drop temperature by 10°C, spread on a clean tray.

Croutons soft after a few days: stored too soon (still warm) or the container isn't airtight. Cool completely first; use a glass jar.

Croutons taste bland: not enough salt or oil. Generous on both. Many people under-season croutons.

Croutons crumble to dust: bread was too stale (rock-hard). Use bread that's chewy-stale, not concrete-stale.

FAQ

Can I freeze croutons?

Yes — they keep frozen for 3 months in a bag. Reheat in a low oven for 5 minutes to crisp.

Can I use fresh bread?

Yes — but bake them 5 minutes longer to drive out extra moisture. Stale bread is better because the structure holds up to oil-saturation.

How long do croutons keep?

3 weeks at room temperature in a sealed container. Add a slice of fresh bread to the jar to keep them dry — works the same way as a slice of bread keeps biscuits soft.

Can I make these without an oven?

Use a very low gas mark in the airing cupboard, or a dehydrator. The dry-roast method works in any low-moisture environment, just slowly.

What's the best oil?

Extra virgin olive oil for flavour. Rapeseed for value. Avoid butter for oven-roasting — it burns. Use butter for pan-frying.

How big should croutons be?

Match them to what you're using them on. Big chunks (2.5cm) for big salads; small cubes (1cm) for soup; medium (1.5cm) for general use.

The maths of croutons

A 100g bag of supermarket croutons costs around £2.50. Stale sourdough that you'd otherwise bin costs nothing. Olive oil is £6 a bottle and lasts you 30 batches. Even being generous, a homemade batch is around 30p — £1.50 cheaper than shop-bought, and incomparably better.

Across a year of weekly croutons, you save £80, reduce food waste by a few kilograms, and eat better salads and soups. One of the highest-impact recipes in the discard repertoire.

The case for keeping a jar permanently stocked

Croutons are not a project — they're a kitchen staple. The way you keep olive oil and sea salt and ground pepper in arm's reach, you should keep a jar of croutons. They're useful for so many small meals — a handful on a soup, a scattering on tonight's salad, croutons-and-yoghurt as a fast lunch — that not having any feels like a small failure.

Bake a batch every two weeks. The discipline of using your own stale bread becomes a habit. Within a month, you'll wonder how you ever cooked without them.

Croutons in the wider waste-not philosophy

Once you start using stale bread for croutons, you'll notice other places stale bread becomes useful: bread pudding for dessert, breadcrumbs for fishcakes and meatballs, bread soup (Tuscan ribollita or Spanish gazpacho), French toast for breakfast, panzanella salad in summer.

Bread, properly used, is one of the lowest-waste foods in any kitchen. The crouton is the entry point — the simplest, most rewarding way to turn a dry end-piece into something that improves the next meal you cook.

Croutons in international context

The crouton concept exists in nearly every cuisine that has bread:

• French croûtons: small cubes for soups and salads, often pan-fried in butter.
• Italian crostini: larger toasted slices, used as a base for toppings.
• Spanish picatostes: typically fried, sweet (cinnamon-sugar) for breakfast.
• Tuscan ribollita: day-old bread used as the base of a vegetable stew.
• Lebanese fattoush: toasted pita pieces in salad.

The basic technique — bread + fat + heat + flavour — is so old and universal that it predates recipe books. The instinct to dry stale bread into something useful is a near-universal human one.

Pre-flavouring vs post-flavouring

The recipe above bakes the croutons with seasoning already mixed in. The alternative is to bake plain and toss with seasoning afterwards. Each has its place:

• Pre-flavoured (recipe above): deeper flavour penetration, slightly less crispy. Best for storage.
• Post-flavoured: brighter, more aromatic. Best for serving immediately.

For everyday use and storage, pre-flavour. For special meals where you want maximum aroma, plain-bake and toss with fresh herbs and warm-melted butter just before serving.