Summary of "I've been searching for this light, airy CHOCOLATE SPONGE CAKE recipe for years"

Light, airy chocolate sponge cake (bakery-style)

Video title: “I’ve been searching for this light, airy CHOCOLATE SPONGE CAKE recipe for years” Presenter/channel: not named (presenter references a separate egg-white whipping video and a blog for the recipe/reviews).

Ingredients

Dry / sifted mix (combine and set aside)
- 2 tbsp all-purpose flour
- 1/3 cup cornstarch
- 2 tbsp cocoa powder
- 1 tsp instant coffee powder
- 1/4 tsp baking powder
- 1/4 tsp salt
Eggs
- 4 large eggs, separated
For egg whites
- 1/8 tsp vinegar
- 1/3 cup granulated sugar
For the egg-yolk base
- 1/3 cup granulated sugar
- 1.5 tbsp warm water
- 2 tsp vanilla
- 2 tbsp unflavored vegetable oil
Simple syrup (to brush sponge)
- 1/4 cup granulated sugar
- 1/4 cup hot water
- Optional: coffee or flavored milk to flavor the syrup
Raspberry jam filling
- 1 cup frozen raspberries
- 3/4 tbsp cornstarch
- 1 tbsp lemon juice
- 3 tbsp granulated sugar
Chocolate whipped cream
- 2 cups cold whipping cream
- 3 tbsp cocoa powder
- 3 tbsp icing (powdered) sugar
- 1/2 tsp vanilla
Decorations / filling additions
- Fresh strawberries (halved) — used between layers and on top

Equipment & prep

Oven preheated to 160°C / 320°F (fan on)
Two 8-inch cake tins: line bottoms with baking paper. Do NOT grease the sides.
Stand mixer or hand mixer (or a whisk for cream)
Spatula (rubber/silicone) and offset spatula for smoothing
Sieve for sifting dry ingredients
Pastry brush (for syrup)
Saucepan for jam
Wire rack, toothpick, thin knife
Heatproof bowl/jar for cooling jam

Important: Do NOT grease the sides of the cake tins — leaving them ungreased helps prevent the sponge from deflating when removed.

Step-by-step method

Prepare pans and dry mix
- Preheat oven to 160°C / 320°F (fan).
- Line the bottom of two 8-inch tins with baking paper; do not grease the sides.
- Combine the dry ingredients listed above and sift; set aside.
Separate eggs
- Separate 4 eggs into yolks and whites. (Hand separation is preferred to avoid breaking yolks.)
Whip egg whites
- In a medium bowl, add egg whites + 1/8 tsp vinegar.
- Whip on medium-high ~30 seconds until frothy.
- Gradually add 1/3 cup granulated sugar.
- Continue whipping: medium-high 2 minutes, then low 1 minute (to help remove large bubbles).
- Whip to stiff peaks. Ensure bowl and whisk are fat-free and avoid overwhipping.
Make yolk base
- In a large bowl combine 1/3 cup sugar + 1.5 tbsp warm water to coat the sugar.
- Add the 4 egg yolks + 2 tsp vanilla.
- Beat on medium-high for 4 minutes, then low for 1 minute until thick and ribbon-forming.
- Stream in 2 tbsp vegetable oil while mixing on medium until combined.
Combine batter (folding technique)
- Gently fold half the whipped egg whites into the yolk mixture with a spatula until just combined (small lumps are fine).
- Sift in half of the dry ingredients and fold gently to combine.
- Fold in the remaining egg whites, then sift in the remaining dry ingredients and fold gently until just combined. Do not overmix.
Bake
- Divide batter evenly between the two 8-inch tins.
- Drop tins lightly on the counter to release large air bubbles; you may run a toothpick through the batter.
- Bake 20 minutes at 160°C / 320°F (fan).
- Check doneness: top should make a small indent that slowly bounces back, or a toothpick should come out clean.
Important cooling steps (to preserve rise and texture)
- Immediately after removing from oven, drop tins from about 10 cm height to release some steam.
- Immediately turn tins over onto a wire rack while the cakes are still in the tins and allow to cool completely (about 1 hour).
- After ~1 hour, run a thin knife around the edges, turn cakes out onto the rack, then flip so they are right-side up.
- Trim off the very thin top layer and tidy the sides for a neat appearance.
Simple syrup
- Mix 1/4 cup sugar + 1/4 cup hot water until dissolved.
- Brush generously over the top and sides of sponge layers (prevents dryness).
- Optional: flavor syrup with coffee or flavored milk.
Raspberry jam filling
- In a saucepan over low heat combine 1 cup frozen raspberries, 3/4 tbsp cornstarch, 1 tbsp lemon juice, and 3 tbsp sugar.
- Heat until raspberries break down and mixture thickens (a few minutes), stirring as it thickens.
- Remove from heat, transfer to a heatproof bowl/jar, cool to room temperature (it will thicken more as it cools). Chill if desired.
Chocolate whipped cream - In a cold bowl add 2 cups cold whipping cream + 3 tbsp cocoa powder + 3 tbsp icing sugar + 1/2 tsp vanilla. - Whisk to stiff peaks. Keep cream cold and avoid overwhipping.
Assembly - Place the first cake layer on the stand. - Spread a thin layer of raspberry jam. - Arrange halved strawberries upside down around the top edge. - Add a generous layer of chocolate whipped cream and smooth with an offset spatula. - Place the second layer on top, spread more cream and arrange strawberries on top for decoration.

Chef tips, tricks & common mistakes to avoid

Do NOT grease the sides of the cake tins; this helps prevent the sponge from deflating when removed.
Ensure all bowls and whisks are free of fat — even a small trace prevents egg whites from whipping properly.
Add vinegar to egg whites to help stabilization.
Whip egg whites to stiff peaks but avoid overwhipping — overwhipping or overmixing can cause collapse.
Fold gently to retain air; a few small lumps are acceptable.
Sift dry ingredients to preserve the airy texture.
Drop tins and run a toothpick through batter before baking to release large bubbles.
Immediately invert tins onto a rack while still hot (and drop from ~10 cm) — these steps are crucial for maintaining height/texture.
Brush sponge with simple syrup because sponge cakes dry out faster than higher-fat cakes.
Keep cream cold and avoid overwhipping the chocolate cream.

Plating and serving

Trim the thin top layer and tidy the sides for clean, even layers.
Use halved strawberries around the perimeter and on top for a fresh decorative finish.
Slice and serve; the cake is very light and pairs well with the raspberry jam and strawberries.

Variations

Flavor the simple syrup with coffee or flavored milk.
Swap the raspberry jam for other fruit jams or fillings (recipe intentionally light on fat; other fillings may increase richness).