This chocolate sponge cake bakes two light, airy layers with cocoa and melted dark chocolate, then sandwiches them with whipped cream. A drizzle of chocolate and a dusting of icing sugar finish it off.
It makes one 20 cm cake that serves 8 to 10. It looks like it came from a bakery, but it only uses a handful of everyday ingredients.
A light sponge comes down to two things: whisking the eggs and sugar long enough, and folding in the flour gently. Rush either one and the cake comes out flat.
Table of Contents
The ribbon test
A sponge cake gets most of its lift from air whisked into the eggs. That’s why this stage takes 5 to 7 minutes and why room temperature eggs matter. Cold eggs won’t whip up as much.
| After | What you see | Ready? |
|---|---|---|
| 1 to 2 minutes | Yellow and frothy | No, keep going |
| 3 to 4 minutes | Paler and doubled in size | Not yet |
| 5 to 7 minutes | Pale, thick and tripled. Lifting the whisk leaves a ribbon that sits on top for a few seconds | Yes, ready to fold |
How to fold without losing air
- Sift the flour and cocoa over the whisked eggs so there are no lumps to chase.
- Use a large metal spoon or spatula. Cut down through the middle, sweep along the bottom and lift up the side.
- Turn the bowl a quarter turn and repeat. Stop as soon as no flour is visible.
- Fold in the cooled melted chocolate and milk the same way. The batter should still look light and airy.
Chocolate Sponge Cake
Course: Dessert, CakeCuisine: AustralianDifficulty: Medium4
servings30
minutes40
minutes300
kcal1
hour10
minutesTwo light, airy chocolate sponge layers filled with whipped cream and finished with a chocolate drizzle and icing sugar. Serves 8 to 10.
Ingredients
- Sponge
4 large eggs, at room temperature
3/4 cup caster sugar
1 cup self-raising flour
1/4 cup cocoa powder
50 g dark chocolate, melted and cooled
2 tablespoons milk
- Filling and Topping
300 ml thickened cream, whipped
100 g dark chocolate, melted, for drizzling
Icing sugar, for dusting
Directions
- Preheat oven to 180 degrees Celsius fan-forced. Grease and line two 20cm round cake tins.
- Whisk eggs and sugar for 5 to 7 minutes until pale, thick and tripled in volume.
- Sift flour and cocoa over the mixture and fold in gently with a metal spoon.
- Fold in melted chocolate and milk until just combined.
- Divide batter between prepared tins and smooth the tops.
- Bake for 20 to 25 minutes until a skewer comes out clean.
- Cool in tins for 10 minutes, then turn out onto a wire rack to cool completely.
- Fill with whipped cream, stack layers, drizzle with chocolate and dust with icing sugar.
Notes
- Whisking time matters: don’t rush the egg and sugar stage. It’s what gives the sponge its lift.
- Fold gently: fold the dry ingredients in with a large metal spoon rather than an electric mixer.
- Room temperature eggs: leave them out for 30 minutes before you start so they whisk to full volume.
- Fill when cool: only fill and decorate the cake once it’s completely cool, or the cream will melt and slide.
Chocolate sponge cake troubleshooting
| Problem | Likely cause | Fix next time |
|---|---|---|
| Dense and flat | Eggs not whisked long enough, or flour stirred in roughly | Whisk to the ribbon stage and fold gently |
| Sank in the middle | Oven opened too early, or underbaked | Leave the door shut for 15 minutes and check with a skewer |
| Dry | Overbaked | Start checking at 20 minutes |
| Stuck to the tin | Tins not lined | Grease and line the base with baking paper |
| Cream sliding off | Cake still warm | Cool completely before filling |
Filling and finishing ideas
- Chocolate ganache: warm equal parts cream and dark chocolate, cool until spreadable, and use instead of whipped cream.
- Raspberries and cream: scatter fresh raspberries over the cream layer. The tartness cuts through the richness.
- Salted caramel: drizzle caramel sauce over the top instead of chocolate.
- Single layer: bake all the batter in one 20 cm tin for 35 to 40 minutes, then split it once cool.
Make ahead and storage
Bake the unfilled layers up to 2 days ahead and keep them wrapped tightly at room temperature. They also freeze for up to 2 months wrapped in plastic and foil. Thaw at room temperature before filling.
Once filled with cream, keep the cake in the fridge for up to 3 days. Take it out 20 minutes before serving so the sponge softens again.
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Frequently asked questions
Why did my chocolate sponge cake turn out dense?
The eggs and sugar weren’t whisked long enough, or the flour was stirred in too hard. Whisk until it leaves a ribbon trail and fold gently.
Do I need to use room temperature eggs?
Yes. Cold eggs don’t whisk to the same volume. Leave them out for about 30 minutes before you start.
Can I make this chocolate sponge cake as a single layer?
Yes. Bake all the batter in one 20 cm tin for 35 to 40 minutes, checking with a skewer, then split it once cool.
How do I stop the layers sliding?
Make sure both layers are completely cool before filling. A dab of cream on the plate also helps hold the bottom layer in place.
Can I freeze chocolate sponge cake?
Yes, the unfilled layers freeze for up to 2 months. Wrap them well and thaw at room temperature before filling.
This chocolate sponge cake is all about patience at the start. Whisk to the ribbon stage, fold gently, and you’ll get soft, light layers every time.
Happy baking,
Ella x
