Why do my cupcake cases peel away from the cake?

The steam that pushes the case away as the cake cools, and the four changes that stop it.

Difficulty: beginner
Time: 10 min
Read: 3 min

Short answer

It is moisture. Cool the cakes out of the tin on a rack so steam escapes, use good-quality greaseproof cases, do not overfill, and store them only once completely cold. Trapped steam is what pushes the paper off.

Cases peel after baking, not during it. As the cake cools it releases steam, and if that steam cannot escape it condenses between cake and paper and lifts the case away.

Step by step

Take them out of the tin immediately.Within a minute or two of coming out of the oven. A hot metal tin holds heat and steam around each cake, which is the main cause.
Cool them on a wire rack.Air underneath as well as around. Cooling on a solid surface traps moisture at the base, exactly where the case comes away first.
Use decent cases.Greaseproof or foil-lined cases hold their shape and resist moisture. Thin, cheap paper cases peel far more readily and also lose their colour.
Do not overfill.Two-thirds full. Overfilled cakes rise over the rim, the batter runs down the outside of the case, and that seam pulls away as it cools.
Check the oven temperature.A cool oven means a longer bake and a wetter cake. An oven thermometer solves a surprising number of baking faults, this one included.
Do not overdo the moisture in the recipe.Very wet batters — heavy on oil, yoghurt, fruit purée or syrup — release more steam and peel more. It is a trade-off against how moist you want the cake.
Store them completely cold and loosely.Warm cakes in a sealed tin steam themselves and the cases lift within hours. Wait until they are properly cold, and do not seal them airtight if they are very moist.
Consider a silicone or metal tin without cases.Greased and floured tins avoid the problem entirely if the paper is not the point.

Tips

Out of the tin, onto a rack, straight away. That single change fixes most cases.
Cheap thin cases peel. Greaseproof ones are worth the small extra cost.
Never put warm cakes in a sealed container.

Common mistakes

Leaving cupcakes to cool in the tin — The tin holds heat and the cases sit in a pocket of trapped steam. That moisture condenses between paper and cake, and the case is lifted away as it cools.
Boxing them up while still slightly warm — Every remaining bit of steam is trapped in the container and ends up in the cases. Cakes that looked fine on the rack are peeling by the morning.

If it doesn't work

Cases peel within an hour

Cause: Cooled in the tin — Fix: Remove them from the tin immediately and cool on a rack.

Cases peel overnight in the tin

Cause: Stored warm or sealed — Fix: Cool completely before storing, and store loosely.

Cases greasy and translucent

Cause: Too much fat, or thin cases — Fix: Use greaseproof cases and check the recipe's fat quantity.

Batter ran down the outside

Cause: Overfilled — Fix: Fill cases two-thirds full.

Cases lost their colour

Cause: Thin paper and a fatty batter — Fix: Use foil-lined or greaseproof cases, which hold their pattern.

Questions people ask

Do more expensive cupcake cases really help?

Yes, noticeably. Greaseproof and foil-lined cases resist moisture and fat, hold their shape and keep their colour. Thin paper cases peel and go translucent whatever you do.

Does using two cases stop them peeling?

It helps them hold their shape and looks neater, and the outer case stays clean, but it does not address the trapped steam. Cooling on a rack out of the tin does more.