Desserts

Apple and Blackberry Crumble with Oat Topping

Tender apples and juicy blackberries bake together beneath a golden, buttery oat crumble topping. This comforting British dessert celebrates the flavours of autumn and is delicious served warm with creamy custard, vanilla ice cream or pouring cream.

Prep: 20 min
Cook: 40 min
Total: 1 hr 5 min
Serves: 6

Our British Kitchen

13 October 2026

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Golden baked apple and blackberry crumble in a rustic baking dish with crisp oat topping and bubbling purple juices

Why You'll Love This Recipe

Tart Bramley apples and sweet, juicy blackberries create Britain's most beloved autumnal flavour harmony.
Rolled oats and demerara sugar in the topping add a delightfully crunchy, toasted texture.
Works perfectly with fresh orchard produce or frozen blackberries straight from the freezer.
A straightforward, comforting family pudding that comes together in one dish with zero specialist equipment.

What You Need

Bramley apples, ripe blackberries, rolled oats, plain flour, cold unsalted butter and demerara sugar—quintessential British autumnal orchard produce combined into a classic dessert.

Fresh Bramley cooking apples, ripe blackberries, rolled oats, flour, cold cubed butter and demerara sugar

Bramley cooking apples (peeled, cored and cut into 3cm chunks) – Prepared weight after peeling and coring. Bramleys break down into a wonderfully fluffy, tart fruit base.
Blackberries (fresh or frozen) – Use fresh in autumn, or add straight from frozen without thawing to prevent a watery filling.
Caster sugar – Tossed with the tart fruit to balance natural acidity without making it overly sweet.
Plain flour (or cornflour) – Tossed through the fruit to absorb released juices and create a luscious, jammy consistency.
Ground cinnamon – Adds a gentle background autumnal warmth that complements both apples and blackberries.
Plain flour – The foundation of the classic British crumble topping.
Rolled oats – Traditional jumbo or rolled porridge oats; adds toasted chewiness and rustic crunch.
Cold unsalted butter, cubed into 1cm pieces – Must be chilled straight from the fridge to rub into distinct, flaky crumbs.
Demerara sugar – Coarse demerara crystals caramelise on the surface for a distinctively crisp, sugary crunch.

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How to Make Apple and Blackberry Crumble with Oat Topping

Step 1: Preheat oven and prepare the fruit

Preheat oven and prepare the fruit. Preheat your oven to 190°C / 170°C fan / Gas Mark 5. Peel, core and chop the Bramley apples into roughly 3cm chunks—avoid cutting them too small so they retain pleasant texture. Place the apple chunks into your 25 × 20cm baking dish along with 200g of blackberries (use straight from frozen if using frozen).

Step 2: Toss fruit with sugar, flour and spice

Toss fruit with sugar, flour and spice. Scatter the caster sugar, 1 tablespoon of plain flour, and ground cinnamon over the fruit in the dish. Toss gently until the fruit is lightly coated. The flour will mingle with natural fruit juices as they bake, thickening the liquid into a rich, glossy compote beneath the crumble.

Step 3: Rub cold butter into flour for crumble

Rub cold butter into flour for crumble. In a large mixing bowl, combine 150g plain flour with the 100g cold cubed butter. Using your fingertips, rub the butter into the flour, lifting the mixture to aerate it, until it resembles coarse breadcrumbs with a few pea-sized butter nuggets remaining for textural variety.

Step 4: Stir in rolled oats and demerara sugar

Stir in rolled oats and demerara sugar. Add the 75g rolled oats and 80g demerara sugar into the rubbed mixture. Stir lightly with a fork or your fingers until evenly distributed. The combination of coarse oats and raw cane sugar guarantees a crunchy, golden topping that never turns greasy.

Step 5: Scatter topping and bake until bubbling

Scatter topping and bake until bubbling. Scatter the oat crumble topping loosely over the fruit until fully covered—do not pack or press down, as loose crumbs crisp far better. Place the dish on a baking tray to catch any drips and bake for 35–40 minutes (add 5 minutes if using frozen blackberries) until the topping is golden brown and rich purple fruit juices bubble vigorously around the edges.

Step 6: Rest briefly and serve warm

Rest briefly and serve warm. Remove from the oven and let stand for 5–10 minutes. The fruit compote beneath the crumble is extremely hot straight from the oven; resting allows the juices to settle and cool to an enjoyable eating temperature. Spoon into bowls and serve warm with hot custard, vanilla ice cream or pouring cream.

Advance Preparation, Crisp Reheating and Storage Advice

Apple and blackberry crumble is wonderfully forgiving for make-ahead entertaining. The dry crumble topping can be rubbed together and refrigerated in an airtight container for up to 3 days, or frozen for up to a month. Leftover baked crumble keeps covered in the fridge for up to 2 days. To restore the topping's crispness, reheat in an oven at 170°C / 150°C fan for 15 minutes; avoid microwaving if possible, as steam softens the oat crust.

How We Serve It at Home

Scoop generous spoonfuls warm from the baking dish straight into dessert bowls. Traditional warm custard is the quintessential British accompaniment; cold pouring cream or a scoop of vanilla ice cream also provides a delightful contrast.

Warm serving of apple and blackberry crumble in a bowl showing purple fruit and crisp golden oat topping, served with custard

Baking Dish Dimensions, Heat Dynamics and Doneness Signs

A 25 × 20cm ceramic or stoneware baking dish (approx. 1.5–2 litres) allows the optimal depth of fruit: thick enough to stay intensely juicy, but broad enough for ample golden oat topping. Baking at 190°C / 170°C fan is critical. A cooler oven will stew the fruit into water before the topping browns, while a hotter oven burns the oats before the apples have collapsed into a tender puree. Look for vigorous purple bubbling at the edges as your primary doneness indicator.

Fruit Science: Bramley Cooking Apples vs Eating Apples

Bramley apples are the undisputed champion of British crumbles because their high acidity and high moisture content cause them to collapse into a cloud-like, velvety puree during baking. Eating apples like Cox or Braeburn hold their shape and yield a chunkier, firmer base. Blackberries provide deep tartness and rich ruby colour; tossing a tablespoon of flour into the fruit helps natural pectin form a glossy, spoonable sauce rather than a watery pool.

Apple and Blackberry Crumble with Oat Topping

No reviews yet

Published by Our British KitchenEasy

Prep Time

20 mins

Cook Time

40 mins

Estimated Total Time

1 hr 5 min

Yield / Servings

6 Servings

Equipment Needed

25 × 20cm ovenproof baking dish (approx. 1.5–2 litre capacity)
Vegetable peeler and sharp paring knife
Large mixing bowl (for crumble topping)
Baking tray (to catch any bubbling juices)
Measuring spoons

Ingredients

Adjust yield quantities or check items off as you prep.

Scale:

700g Bramley cooking apples (peeled, cored and cut into 3cm chunks): Prepared weight after peeling and coring. Bramleys break down into a wonderfully fluffy, tart fruit base.
200g blackberries (fresh or frozen): Use fresh in autumn, or add straight from frozen without thawing to prevent a watery filling.
50g caster sugar: Tossed with the tart fruit to balance natural acidity without making it overly sweet.
1 tbsp plain flour (or cornflour): Tossed through the fruit to absorb released juices and create a luscious, jammy consistency.
½ tsp ground cinnamon: Adds a gentle background autumnal warmth that complements both apples and blackberries.
150g plain flour: The foundation of the classic British crumble topping.
75g rolled oats: Traditional jumbo or rolled porridge oats; adds toasted chewiness and rustic crunch.
100g cold unsalted butter, cubed into 1cm pieces: Must be chilled straight from the fridge to rub into distinct, flaky crumbs.
80g demerara sugar: Coarse demerara crystals caramelise on the surface for a distinctively crisp, sugary crunch.

Instructions

Preheat oven to 190°C / 170°C fan / Gas Mark 5. Peel, core and chop apples into 3cm chunks. Place in a 25 × 20cm baking dish with blackberries (do not thaw if frozen).
Sprinkle caster sugar, 1 tbsp flour and cinnamon over the fruit. Toss gently to coat evenly.
In a bowl, rub cold cubed butter into flour using fingertips until it looks like coarse breadcrumbs with some small pea-sized lumps.
Stir in rolled oats and demerara sugar until evenly distributed throughout the crumble mixture.
Scatter topping loosely over fruit—do not press down. Place on a baking tray and bake 35–40 minutes (45 mins if fruit was frozen) until golden and juices bubble at the sides.
Rest for 5–10 minutes before serving. Spoon into bowls and serve warm with custard, pouring cream or vanilla ice cream.

Nutrition Information

Per ServingServing: 1 portion (1/6 of crumble)

Calories

411kcal

Total Fat

15g

Protein

Carbohydrates

66g

Dietary Fiber6 g

Total Sugars36 g

Sodium7 mg

Calcium42 mg

Iron1.6 mg

Chef's Notes & Expert Advice

Keep your butter fridge-cold right until the moment of rubbing in. If your kitchen is warm, place the bowl of cubed butter in the freezer for 10 minutes beforehand; cold butter creates distinct flaky pockets, whereas warm butter smears into a dense paste. Never press the crumble topping down onto the fruit—leaving it loose and irregular creates peaks that toast to a brittle crunch in the oven. If using frozen blackberries, do not thaw them; adding them frozen prevents premature juice release and keeps the crumble base crisp.

Frequently Asked Questions

Yes, dessert apples such as Cox, Braeburn or Granny Smith work well. They hold their shape during baking, giving a firmer, chunkier fruit filling rather than a soft compote. Since eating apples are naturally sweeter, you can reduce the caster sugar in the fruit layer by 15–20g.

Yes, frozen blackberries work brilliantly. Add them straight from the freezer without defrosting; thawing beforehand releases excess liquid that makes the crumble soggy. Simply add 5 minutes to the total baking time to ensure the fruit heats through completely.

Use cold butter cut into small cubes and rub it in lightly with your fingertips without overworking. Never press the topping down when assembling the dish—leaving loose mounds allows hot air to circulate, toasting the oats and demerara sugar to a brittle crunch.

Yes. You can freeze the assembled unbaked crumble for up to 2 months; bake straight from frozen at 180°C / 160°C fan for 50–55 minutes. You can also freeze the rubbed dry oat topping separately in a zip-top bag for up to 3 months.

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Apple and Blackberry Crumble with Oat Topping

No reviews yet

Published by Our British KitchenEasy

Prep Time

20 mins

Cook Time

40 mins

Estimated Total Time

1 hr 5 min

Yield / Servings

6 Servings

Equipment Needed

25 × 20cm ovenproof baking dish (approx. 1.5–2 litre capacity)
Vegetable peeler and sharp paring knife
Large mixing bowl (for crumble topping)
Baking tray (to catch any bubbling juices)
Measuring spoons

Ingredients

Adjust yield quantities or check items off as you prep.

Scale:

700g Bramley cooking apples (peeled, cored and cut into 3cm chunks): Prepared weight after peeling and coring. Bramleys break down into a wonderfully fluffy, tart fruit base.
200g blackberries (fresh or frozen): Use fresh in autumn, or add straight from frozen without thawing to prevent a watery filling.
50g caster sugar: Tossed with the tart fruit to balance natural acidity without making it overly sweet.
1 tbsp plain flour (or cornflour): Tossed through the fruit to absorb released juices and create a luscious, jammy consistency.
½ tsp ground cinnamon: Adds a gentle background autumnal warmth that complements both apples and blackberries.
150g plain flour: The foundation of the classic British crumble topping.
75g rolled oats: Traditional jumbo or rolled porridge oats; adds toasted chewiness and rustic crunch.
100g cold unsalted butter, cubed into 1cm pieces: Must be chilled straight from the fridge to rub into distinct, flaky crumbs.
80g demerara sugar: Coarse demerara crystals caramelise on the surface for a distinctively crisp, sugary crunch.

Instructions

Preheat oven to 190°C / 170°C fan / Gas Mark 5. Peel, core and chop apples into 3cm chunks. Place in a 25 × 20cm baking dish with blackberries (do not thaw if frozen).
Sprinkle caster sugar, 1 tbsp flour and cinnamon over the fruit. Toss gently to coat evenly.
In a bowl, rub cold cubed butter into flour using fingertips until it looks like coarse breadcrumbs with some small pea-sized lumps.
Stir in rolled oats and demerara sugar until evenly distributed throughout the crumble mixture.
Scatter topping loosely over fruit—do not press down. Place on a baking tray and bake 35–40 minutes (45 mins if fruit was frozen) until golden and juices bubble at the sides.
Rest for 5–10 minutes before serving. Spoon into bowls and serve warm with custard, pouring cream or vanilla ice cream.

Nutrition Information

Per ServingServing: 1 portion (1/6 of crumble)

Calories

411kcal

Total Fat

15g

Protein

Carbohydrates

66g

Dietary Fiber6 g

Total Sugars36 g

Sodium7 mg

Calcium42 mg

Iron1.6 mg

Chef's Notes & Expert Advice

Keep your butter fridge-cold right until the moment of rubbing in. If your kitchen is warm, place the bowl of cubed butter in the freezer for 10 minutes beforehand; cold butter creates distinct flaky pockets, whereas warm butter smears into a dense paste. Never press the crumble topping down onto the fruit—leaving it loose and irregular creates peaks that toast to a brittle crunch in the oven. If using frozen blackberries, do not thaw them; adding them frozen prevents premature juice release and keeps the crumble base crisp.