Fluffy sponge cake: how to get a light, stable crumb
For a fluffy sponge cake, the egg foam must be properly developed, the flour folded in with minimal air loss, and the centre baked until the structure is set.
PEK Academy
Technical guidance for stable sponge cakes, even layers, smooth creams and clean cake assembly. Topics include whipping, emulsions, ingredient ratios, baking temperatures, cooling, filling stability and the causes of collapsing, sliding or weak cake structures.
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For a fluffy sponge cake, the egg foam must be properly developed, the flour folded in with minimal air loss, and the centre baked until the structure is set.
For beginners, the easiest options are ready-to-use writing icing on a sufficiently stable cake surface and an edible marker on dry, firm fondant or set icing.
A soft, even egg-foam sponge depends on three things: a stable foam, flour folded in with minimal air loss, and enough baking for the centre to set.
Whole eggs and sugar are usually ready when the mixture is much paler and larger in volume, and falls from the whisk in a broad, thick ribbon that remains visible on the surface for a few seconds.
The same batter spreads over more area in a larger pan, so the layer starts and finishes shorter.
For the same layer depth in two round pans, multiply the entire recipe by new diameter² ÷ old diameter². If the target layer is also deeper or shallower, include the depth ratio.
Pan diameter alone does not determine the correct cake height. If you keep the same height, required cake volume rises with the square of the diameter.
For an 18 → 24 cm round pan, use (24/18)² = 1.78. Scale the formula to keep batter depth similar, weigh eggs without shells, and do not automatically change temperature or multiply bake time just because the…