A dry cake is usually overbaked by minutes, not by degrees

There is a settled way of talking about dry cake crumb. It is worth asking how much of it survives contact with the detail.

Why the last minutes cost the most

For most of a bake, evaporating water keeps the crumb temperature near boiling and the loss is steady. Once the structure has set and the free water at the surface is gone, the interior temperature climbs and drying accelerates.

That means the difference between a moist cake and a dry one can be a short overrun rather than a long one. It also means the visual signs change slowly while the texture changes quickly, which is why bakers get caught out. Checking earlier than you think necessary is a better habit than checking once at the stated time.

Testing without misleading yourself

A skewer emerging with a few moist crumbs is the target, and one emerging perfectly clean often means you went too far. Rich or very moist cakes can leave a skewer sticky even when set, which pushes bakers into overbaking them. The cake pulling slightly away from the sides of the tin is a reasonably reliable sign in most sponges.

At oven temperature, a probe reading in the centre is the most consistent test if your recipe gives a figure to aim at. A gentle press on the surface that springs back rather than leaving a dent is a useful secondary check.

Recipe factors that make a cake dry

Too little fat or sugar leaves fewer of the ingredients that hold moisture in the crumb after baking. Too much flour, often from measuring by volume rather than weight, dries a cake before it reaches the oven.

In the tin, over-scaling a recipe into a larger tin without adjusting the time produces overbaked edges and a dry result overall. Reducing the sugar in a recipe for taste reasons has a texture cost that is rarely mentioned in the substitution. Cakes with acidic dairy, oil or an invert sugar all resist drying better than lean butter and caster sugar batters.

Tin and oven effects

A shallow batter in a wide tin has more surface area and dries considerably faster than the same batter in a deep one. A dark tin browns and dries the edges before the middle is set, which gives a dry rim around a good centre.

A fan oven strips moisture from the surface faster, so a recipe written for a conventional oven may need adjusting. Ovens running hot dry a cake while appearing to bake it in the stated time, which is a very common cause.

Baking on too high a shelf exposes the top to direct radiant heat and crusts it before the centre is done.

What to do with a dry cake

A soaking syrup brushed over the cut surfaces restores a good deal of moisture and is the standard rescue. A moist filling such as a fruit compote, cream or curd compensates once the cake is assembled.

Once the crumb sets, trimming the driest outer edges before assembly removes the worst of it and improves every slice. Trifle, cake crumbs and rum-soaked puddings are all traditional destinations for a cake that came out dry. Wrapping it while very slightly warm traps some steam and softens the crumb, though it must not be wrapped hot.

Preventing it next time

Weigh rather than measure by volume, since flour is the ingredient most often overmeasured. Start checking well before the stated time, particularly in an oven you have not calibrated. Use a tin close to the size the recipe names, or adjust the bake accordingly if you cannot.

By the second rise, wrap the cake once cool rather than leaving it open on a rack for hours after it has cooled. If the same recipe dries repeatedly, the ratios are the problem rather than your timing.

The takeaway

Check early, accept a few moist crumbs on the skewer, and stop treating a clean skewer as the goal.

Temperature and time are the same argument held at opposite ends.