Apple and Oat Crumble with a Golden Topping

Ingredients

• 800 g apples, weighed after peeling and coring, cut into 1 cm pieces
• 40 g light brown sugar for the filling
• 1 tablespoon lemon juice
• 1 teaspoon ground cinnamon, divided
• 1 tablespoon cornflour/cornstarch, about 8 g
• 2 tablespoons water
• 120 g plain all-purpose flour
• 80 g rolled oats
• 90 g cold unsalted butter, cubed, plus a little for greasing
• 70 g light brown sugar for the topping
• 1/4 teaspoon fine salt

Instructions

1. Prepare the oven and dish. Heat the oven to 190°C/170°C fan/375°F. Lightly grease a shallow baking dish about 20 × 25 cm, or around 1.5–2 litres in capacity. Put it on a rimmed baking tray to catch any fruit juice that bubbles over. Avoid a deep narrow dish, which makes a thick fruit layer that cooks slowly.
2. Season the apples. Mix the 40 g filling sugar with cornflour and half the cinnamon. Toss with the prepared apples, lemon juice and water until the pieces are evenly coated. Spread in the dish without packing them down hard. Use apples that are sound and free of mould, and cut the pieces to similar sizes.
3. Rub in the butter. Put flour and salt in a bowl. Add the cold butter and rub it in with fingertips until the mixture looks like coarse crumbs with a few pea-size pieces. Stop before the butter becomes a smooth paste. If your kitchen is warm, chill the bowl for 10 minutes before continuing, allowing that extra time.
4. Finish the topping. Stir in oats, the remaining 70 g sugar and remaining cinnamon. Squeeze a few handfuls gently to make small clusters, then scatter over the apples in a loose, even layer. Do not press it into a solid lid: gaps let steam escape and help the topping stay crumbly.
5. Bake until the fruit is tender. Bake for about 35–45 minutes, until the topping is golden and juices bubble at the edges. Push a small knife down through a gap: the apples should offer little resistance. If the top browns before the fruit softens, cover loosely with foil and continue baking. Check the centre as well as the outer edge.
6. Rest and serve. Set on a heatproof surface and rest for 10 minutes before spooning into bowls. The fruit beneath the topping stays very hot. Serve plain or with custard, cream or ice cream added separately. A little settled juice is normal; it should coat the fruit rather than flood the bowl.

Tips and troubleshooting

Juicy apple varieties release different amounts of liquid. The small amount of cornflour binds those juices without making a stiff pie filling. If a previous batch was watery, use a shallower dish and confirm the juices are bubbling before removing it. A pale topping often means the oven was not fully heated or the crumb layer was too thick. Do not increase the heat dramatically once the oats start browning.

Substitutions and serving ideas

Replace up to 200 g of the prepared apples with firm ripe pear pieces for a softer, sweeter filling. A baking block intended for pastry can replace butter, though flavour and spread may differ. For a gluten-free attempt, use a suitable flour blend and certified gluten-free oats; check all labels and expect a different crumb texture.

Allergen notes

Contains wheat, oats and milk. Oats can be contaminated with other gluten-containing cereals. Custard or ice cream can introduce egg and additional milk, so include any serving extras when assessing allergens.

Storage

Cool leftovers in a shallow container and refrigerate within 2 hours, or within 1 hour in temperatures above 32°C/90°F. Keep at 4°C/40°F or colder and use within 3 days. Reheat the portion needed until thoroughly hot, ideally to 74°C/165°F, in an oven to restore some crispness. Store cold serving sauces separately.