The Two-Slice Sponge: Air-Fryer Cakes for a Cosy November Night In

There is a particular sort of November evening when the idea of cake arrives fully formed: something warm, simple and just big enough for two. The trouble is that heating a full oven for one modest sponge can feel like warming a cathedral to toast a crumpet. Enter the air fryer. It is not a replacement for your main oven, and it will not bake a three-tier centrepiece, but for a small tin, a last-minute craving or a two-person household, it is a genuinely useful little workhorse.

This is not about pretending an air fryer bakes exactly like a fan oven. It does not. But once you know its quirks, it can turn out a lovely little sponge while the kettle boils and the Strictly results are still being debated. Here is how to make that happen without a trail of dry crumbs and swearing.

First, the tin question

Before you mix anything, measure the inside of your air fryer basket. Most standard UK models sit somewhere between 4.5 and 6 litres, and that space decides everything. A 15cm round cake tin is the sweet spot for many baskets. A 1lb loaf tin often fits too, as do silicone muffin cases and small silicone moulds. Some larger air fryers will take a 17cm tin, but check the clearance around the sides and above the tin. Batter needs room to rise, and the tin should never touch the heating element.

Loose baking parchment is a menace in an air fryer. It can lift and catch on the element, so use a parchment disc that sits flat, or line the tin properly and keep the edges tucked in. Springform tins are handy, but check they fit without forcing the basket closed. Glass dishes should only go in if your manufacturer explicitly says they are suitable. When in doubt, use metal or silicone.

The sponge that plays nicely

A simple all-in-one sponge is the most reliable starting point. For a 15cm tin, beat 100g soft butter, 100g caster sugar, 100g self-raising flour and 2 eggs until pale and smooth. Add a teaspoon of vanilla and a small pinch of salt. That is enough batter for a two-layer cake or four generous wedges. If you want a loaf, scale up slightly and use a 1lb tin, but keep the batter to about two-thirds of the tin depth.

Preheat the air fryer at 160C for a few minutes. Lower temperatures suit cakes better than fierce heat, because the top can set and brown before the middle has caught up. Spoon the batter in, level it gently and bake. As a rough guide, a 15cm round sponge takes 25 to 30 minutes at 160C. A 1lb loaf takes 30 to 38 minutes. Six cupcakes take 12 to 15 minutes. A 12cm tin takes around 20 to 25 minutes at 150C. Every machine is different, so check two or three minutes before you think you need to.

The rules that stop a dry crumb

Do not open the basket constantly. Air fryers lose heat quickly, and a cake that keeps being inspected can sink in the middle. Check through the drawer if you can, and only pull it out properly near the end. If the top is browning too fast, lay a small piece of foil loosely over the tin. Do not press it down.

Fill tins no more than two-thirds full. A cake that climbs over the rim will look rustic in a way you did not plan. Rotate the tin halfway through only if your machine browns unevenly, and do it quickly. Cool the cake in the tin for five minutes before turning it out, then leave it on a rack. A little patience here stops the crumb from breaking.

Finishing ideas for a small cake

A two-person cake does not need a production line of frosting. Split the sponge and fill it with raspberry jam and lightly whipped cream. Or make a quick lemon drizzle by mixing the juice of half a lemon with 50g icing sugar and spooning it over the warm cake. Chocolate ganache is easy too: warm 50ml double cream, pour it over 50g chopped dark chocolate, stir until glossy and spread it over the top. For a nursery-comfort finish, brush the warm sponge with melted butter and press over a mix of caster sugar and cinnamon.

If you want a proper frosting, keep it small. Beat 50g soft butter with 100g icing sugar, a splash of milk and a drop of vanilla. That is plenty for a 15cm cake. A little cream cheese frosting works nicely with carrot or banana flavours, but use it the same day.

When the air fryer is not the answer

Be honest about the limits. Air fryers are brilliant for small sponges, loaf cakes, brownies in a small tin and muffins. They are not ideal for very delicate whisked sponges, large celebration cakes or anything that needs a long, gentle bake. They also vary wildly between models, so an internet timing is a starting point, not a promise. And while a small appliance can feel more efficient than heating a big oven, it is not a guaranteed energy-saving miracle. The win is convenience and size, not a maths equation.

A cosy little routine

Preheat the air fryer while you weigh the ingredients. Mix the batter by hand or with a hand whisk. Get the cake in, put the kettle on and tidy the bowl. Twenty-five minutes later you have a warm little sponge, a clean-ish kitchen and no reason to eat a whole celebration cake between two people. That is the quiet joy of the small tin: cake without the ceremony, on a dark November night, exactly when you want it.