Airy Sponge Cake with White Chocolate and Blueberries on a Chocolate Cookie Crust

This cake brings together a tender, airy sponge, a stable white chocolate cream, and fresh berries over a crisp chocolate cookie crust. It looks polished enough for a special occasion, yet the method is entirely manageable at home: clear steps, familiar techniques, and a striking final result.

Ingredients

Chocolate Base

• Chocolate cookies — 250 g (8.8 oz)
• Butter, melted — 90 g (3.2 oz)
• Salt — a pinch

Sponge Cake

• Eggs — 4
• Sugar — 120 g (1/2 cup plus 2 tbsp)
• All-purpose flour — 140 g (1 1/8 cups)
• Cornstarch — 20 g (2 1/2 tbsp)
• Baking powder — 1 tsp
• Vanilla extract — 1 tsp
• Salt — a pinch

Soaking Syrup

• Water — 80 ml (1/3 cup)
• Sugar — 40 g (3 tbsp)
• Lemon juice — 1 tsp or berry liqueur — 1 tbsp (optional)

White Chocolate Cream

• White chocolate — 250 g (8.8 oz)
• Heavy cream, 33–35% — 400 ml (1 2/3 cups) (200 ml / 3/4 cup for the ganache + 200 ml / 3/4 cup for whipping)
• Cream cheese — 250 g (8.8 oz)
• Powdered sugar — 40 g (1/3 cup)
• Powdered gelatin — 8 g (about 2 1/2 tsp) + water — 40 ml (2 tbsp plus 2 tsp) for blooming
• Berries (blueberries or blackcurrants) — 200 g (7 oz)

For Decoration

• Berries for the top — 150 g (5.3 oz)
• Chocolate shavings — 20 g (3/4 oz)
• Fresh mint — a few leaves

Step-by-Step Recipe

1. Prepare the pan: line the base of a 20–22 cm (8–9 in) springform or cake ring with parchment, and line the sides with acetate or a strip of parchment.
2. Make the base: pulse the chocolate cookies into fine crumbs, then mix with the melted butter and a pinch of salt until the mixture resembles damp sand. Press firmly and evenly into the bottom of the pan.
3. Pre-bake the base for 8 minutes at 170°C (340°F) using top and bottom heat, just until set. Let cool for 5 minutes.
4. Make the sponge: combine the flour, cornstarch, baking powder, and a pinch of salt.
5. Beat the eggs with the sugar for 7–10 minutes, until pale, voluminous, and ribbon-like. Mix in the vanilla.
6. Gently fold in the dry ingredients in 2–3 additions with a spatula, keeping the batter as airy as possible.
7. Pour the batter over the slightly cooled base and smooth the top. Bake for 25–30 minutes at 170°C (340°F), until a toothpick comes out clean. Cool completely in the pan.
8. Make the syrup: bring the water and sugar to a boil, then cool. Stir in the lemon juice or liqueur. Brush the cooled sponge lightly with the syrup, taking care not to soak it through.
9. For the cream: bloom the gelatin in 40 ml (2 tbsp plus 2 tsp) cold water for 10 minutes. Heat 200 ml (3/4 cup) of the cream until steaming, but do not let it boil. Remove from the heat, add the chopped white chocolate, and stir until smooth. Dissolve the bloomed gelatin into the hot ganache, then let it cool to room temperature, about 25–28°C (77–82°F).
10. Whip the remaining 200 ml (3/4 cup) of cream with the powdered sugar to soft peaks. In a separate bowl, beat the cream cheese until smooth.
11. Combine the cooled white chocolate ganache with the cream cheese, then fold in the whipped cream in 2–3 additions. The cream should be light, voluminous, and stable.
12. Assemble: spread half of the cream over the soaked sponge, scatter with berries, cover with the remaining cream, and smooth the surface. Chill for 2–3 hours until set.
13. Decorate with berries, chocolate shavings, and mint. Remove from the pan and serve chilled.

Nutrition per Serving

Item	Per serving
Calories	460 kcal
Protein	7 g
Fat	30 g
Carbohydrates	42 g
Sugar	28 g
Fiber	2 g
Sodium	180 mg

Tips and Variations

• Pan size: 20–22 cm (8–9 in) works best. A smaller pan will give you a taller cake and a longer bake time.
• Without gelatin: replace it with a ganache monté — increase the cream to 500 ml (2 cups) total (200 ml / 3/4 cup for the ganache + 300 ml / 1 1/4 cups for whipping), then chill the cake well for 4–6 hours.
• Berries: fresh berries hold their shape best; if using frozen berries, thaw them in a sieve and pat dry.
• Soaking: keep it light so the cookie base stays crisp.
• Chocolate: use good-quality white chocolate with at least 26% cocoa butter for a more stable cream.

Storage and Serving

• Store the cake in the refrigerator for up to 3 days, covered with a cake dome or plastic wrap.
• Before serving, let it stand at room temperature for 10–15 minutes so the cream opens up in flavor and texture.
• Freezing: possible for up to 1 month without the berry decoration. Thaw in the refrigerator for 6–8 hours.

Frequently Asked Questions

• Can I substitute the blueberries? Yes, blackcurrants, raspberries, or a mix of forest berries will work well.
• My cream turned out too loose — what should I do? Chill the bowl and beaters, let the ganache cool to 25–28°C (77–82°F), then fold in the whipped cream again and chill the cake for 2–3 hours.
• The base crumbles when sliced? Press the crumb layer more firmly and allow the cake to set completely. Warm the knife in hot water and wipe it dry before cutting.
• Can I bake the sponge separately? Yes. Bake it in the same ring without the cookie base, then transfer it onto the prepared, cooled cookie crust.
• What can I use to soak it if I don’t want syrup? Use sweetened lemon tea or diluted berry juice — just a few teaspoons, so the base doesn’t become soggy.