Quick Recipe Version (TL;DR)
Quick Ingredients
- Matcha sponge: 90 g almond flour, 90 g powdered sugar, 20 g flour, 2 tsp matcha, 3 large eggs, 2 large egg whites, 50 g sugar, 25 g melted butter, pinch salt.
- Vanilla syrup: 120 ml water, 100 g sugar, 1–2 tsp vanilla extract or 1 vanilla bean.
- White chocolate ganache: 300 g white chocolate, 150 ml heavy cream, 15 g butter, pinch salt, 1/2 tsp vanilla.
- Vanilla cream: 250 g mascarpone, 240 ml heavy cream, 60 g powdered sugar, 1 vanilla bean (or 2 tsp extract), pinch salt.
- Matcha glaze: 200 g white chocolate, 120 ml heavy cream, 1–1.5 tsp matcha, 1 tsp neutral oil.
- Extras: Extra matcha or white chocolate curls for garnish.
Do This
- 1. Line a 23 × 33 cm (9 × 13 in) pan with parchment and preheat oven to 190°C/375°F.
- 2. Whip almond flour, powdered sugar, matcha, and whole eggs; fold in whipped egg whites, flour, and melted butter. Bake 10–12 minutes, cool completely.
- 3. Simmer water and sugar 2–3 minutes, stir in vanilla, cool to make syrup.
- 4. Make white chocolate ganache and vanilla mascarpone cream; chill ganache until thick but spreadable.
- 5. Cut sponge into 3 equal rectangles. Layer: sponge + syrup + ganache, sponge + syrup + vanilla cream, sponge + syrup + thin layer of vanilla cream. Chill 1 hour.
- 6. Make matcha white chocolate glaze, cool slightly, pour over chilled cake. Chill again, then trim edges and slice into neat bars.
Why You’ll Love This Recipe
- A modern twist on the classic French Opéra cake with a delicate Japanese matcha accent.
- Beautiful layers of pale green sponge, silky vanilla cream, and rich white chocolate for a show-stopping dessert.
- Balanced flavors: gentle bitterness from matcha, soft vanilla warmth, and creamy sweetness.
- Surprisingly doable at home with make-ahead elements and clear, step-by-step directions.
Grocery List
- Produce: 1–2 vanilla beans (optional but lovely), fresh flowers for serving (optional garnish).
- Dairy: Unsalted butter, mascarpone cheese, heavy cream (whipping cream), whole eggs, egg whites (or extra eggs).
- Pantry: Almond flour, powdered (icing) sugar, granulated sugar, all-purpose or cake flour, matcha powder (unsweetened), fine salt, vanilla extract, white chocolate, neutral oil (grapeseed or sunflower), parchment paper.
Full Ingredients
For the matcha joconde sponge
- 90 g finely ground almond flour (about 3/4 cup, lightly packed)
- 90 g powdered (icing) sugar (about 3/4 cup)
- 20 g all-purpose or cake flour (about 3 tablespoons, spooned and leveled)
- 2 teaspoons (about 4 g) unsweetened matcha powder, plus more for garnish if desired
- 3 large whole eggs, at room temperature
- 2 large egg whites, at room temperature
- 50 g granulated sugar (1/4 cup)
- 25 g unsalted butter (2 tablespoons), melted and cooled slightly
- 1/4 teaspoon fine sea salt
For the vanilla soaking syrup
- 120 ml water (1/2 cup)
- 100 g granulated sugar (1/2 cup)
- 1–2 teaspoons pure vanilla extract or seeds scraped from 1 vanilla bean
For the white chocolate ganache layer
- 300 g good-quality white chocolate, finely chopped (about 1 3/4 cups chips or discs)
- 150 ml heavy cream (2/3 cup)
- 15 g unsalted butter (1 tablespoon), at room temperature
- 1/2 teaspoon pure vanilla extract (optional, but nice)
- Pinch of fine sea salt
For the vanilla cream layer
- 250 g mascarpone cheese, cold (about 1 cup, level)
- 240 ml heavy cream, cold (1 cup)
- 60 g powdered (icing) sugar (1/2 cup), sifted
- Seeds from 1 vanilla bean or 2 teaspoons pure vanilla extract
- Pinch of fine sea salt
For the matcha white-chocolate glaze & garnish
- 200 g white chocolate, finely chopped (about 1 1/4 cups)
- 120 ml heavy cream (1/2 cup)
- 1–1.5 teaspoons unsweetened matcha powder, sifted
- 1 teaspoon neutral oil (such as grapeseed or sunflower) for shine
- Optional garnish: extra matcha powder for dusting, white chocolate curls, or thin shards of white chocolate
Step-by-Step Instructions
Step 1: Prepare your pan and preheat the oven
Preheat your oven to 190°C/375°F with a rack in the middle. Line a 23 × 33 cm (9 × 13 in) rectangular baking pan with parchment paper, leaving an overhang on the long sides so you can lift the cake out later. Lightly grease the parchment and sides of the pan.
Bring your eggs and egg whites to room temperature if you have not already; this helps them whip up with more volume. Weigh or measure out all the ingredients for the sponge so everything is ready to go, as the batter comes together quickly.
Step 2: Make the matcha joconde sponge
In a medium bowl, whisk together the almond flour, powdered sugar, matcha powder, and salt until no lumps remain. If your almond flour or powdered sugar is lumpy, sift them first for the smoothest batter.
Add the 3 whole eggs to the dry mixture. Using a hand mixer or stand mixer with the whisk attachment, beat on medium-high speed for 4–5 minutes until the mixture becomes thick, pale, and ribbons off the whisk.
In a separate clean bowl, begin whipping the 2 egg whites on medium speed until foamy. Gradually add the 50 g (1/4 cup) granulated sugar and continue whisking until you reach glossy soft-to-medium peaks. You want the meringue to be stable but still supple.
Sift the 20 g (about 3 tablespoons) flour over the pale almond–egg mixture and fold it in gently with a spatula. Then fold in one-third of the meringue to lighten the batter. Add the remaining meringue in two more additions, folding carefully so you do not deflate the mixture.
Finally, drizzle in the cooled melted butter around the edges of the bowl and fold it in just until no streaks remain. Immediately scrape the batter into the prepared pan and spread it into an even, thin layer with an offset spatula.
Bake for 10–12 minutes, until the sponge is just set, lightly springy to the touch, and only very lightly golden at the edges. Do not overbake; you want a soft, flexible cake. Let the sponge cool completely in the pan on a wire rack.
Step 3: Prepare the vanilla soaking syrup
While the sponge cools, make the syrup. In a small saucepan, combine the water and sugar. Bring to a gentle simmer over medium heat, stirring until the sugar fully dissolves. Let it simmer for 1–2 minutes, then remove from the heat.
Stir in the vanilla extract or vanilla bean seeds. Pour into a heatproof container and let it cool to room temperature. This syrup will keep the matcha sponge wonderfully moist and carry the vanilla aroma through every bite.
Step 4: Make the white chocolate ganache layer
Place the chopped white chocolate in a medium heatproof bowl. In a small saucepan, heat the heavy cream over medium heat until it just begins to simmer around the edges; do not let it boil. Immediately pour the hot cream over the white chocolate, making sure all the chocolate is covered.
Let the mixture sit undisturbed for 2–3 minutes to soften the chocolate. Then gently whisk from the center outward until smooth, glossy, and fully emulsified. Add the butter, vanilla, and a pinch of salt, stirring until completely combined.
Cover the bowl loosely and let the ganache cool at room temperature, stirring occasionally, until it thickens to a spreadable consistency, similar to soft peanut butter. If your kitchen is warm, you can speed this up by refrigerating it for 15–20 minutes, stirring every 5 minutes so it cools evenly and does not firm up too much.
Step 5: Whip the vanilla cream layer
In a medium bowl, add the cold mascarpone, sifted powdered sugar, vanilla, and a pinch of salt. Using a hand mixer on low speed, beat just until smooth and combined, about 30–60 seconds. Do not overbeat the mascarpone on its own or it can turn grainy.
In a separate chilled bowl, whip the cold heavy cream to soft peaks using a hand mixer or stand mixer. The cream should hold its shape but the tips should gently curl over when you lift the whisk.
Add one-third of the whipped cream to the mascarpone mixture and gently fold it in to loosen the mixture. Fold in the remaining whipped cream in two more additions, using broad, gentle motions to keep the mixture light and airy. You should end up with a smooth, fluffy, yet fairly stable vanilla cream. Keep it in the refrigerator while you prepare to assemble.
Step 6: Assemble and layer the cake
Once the matcha sponge is completely cool, run a thin knife around the edges of the pan and lift the cake out using the parchment overhang. Place it on a cutting board and carefully peel away the parchment from the bottom.
Trim a very thin strip (2–3 mm) from each edge to remove any browned edges and reveal the soft green interior. Measure the cake and cut it into 3 equal rectangles along the length of the cake (for a 23 × 33 cm / 9 × 13 in sponge, you will get three pieces roughly 9 × 4.25 in / 23 × 11 cm each).
Place one sponge layer on a parchment-lined tray or board. Generously brush the surface with the cooled vanilla syrup; the cake should feel moist but not soggy. Spread the white chocolate ganache evenly over this first layer, leaving a tiny margin (2–3 mm) at the edges if needed.
Top with the second sponge layer, aligning it carefully. Brush with more vanilla syrup. Spread about two-thirds of the vanilla cream over this layer in an even, smooth sheet.
Place the final sponge layer on top, press very gently, and brush again with syrup. Use the remaining vanilla cream to apply a thin, smooth coat over the top (and, if you like, a light skim on the sides) to create an even surface for the glaze. Chill the assembled cake, uncovered, for at least 1 hour in the refrigerator to firm up the layers.
Step 7: Glaze, chill, and slice
When the cake is well chilled and firm to the touch, prepare the glaze. Place the chopped white chocolate and sifted matcha powder in a heatproof bowl. In a small saucepan, heat the heavy cream until just simmering, then pour it over the chocolate and matcha. Let sit for 2–3 minutes, then whisk gently until completely smooth and evenly green. Stir in the neutral oil for extra shine.
Let the glaze cool, stirring occasionally, until it is slightly thickened and just warm to the touch, about 30–32°C (86–90°F). It should flow like warm honey, not like water.
Set the chilled cake on a wire rack placed over a rimmed baking sheet to catch drips. Pour the matcha glaze over the center of the cake, letting it flow to the edges and down the sides. Use a small offset spatula to nudge it only as needed; minimal handling keeps the surface glassy and smooth.
If you like, dust a narrow stripe of matcha along one edge or decorate with white chocolate curls for a refined Franco–Japanese look. Chill the glazed cake for at least 1 more hour, until the glaze is set.
To serve, transfer the cake to a cutting board. Dip a long, sharp knife in hot water and wipe it dry between every cut for clean slices. Trim the edges for a neat rectangle, then cut into 10 elegant bars. Serve well chilled so the layers stay defined.
Pro Tips
- Use good matcha: A vibrant, high-quality culinary matcha gives the sponge and glaze a beautiful green color and gentle tea flavor without bitterness.
- Do not overbake the sponge: The joconde should stay soft and flexible. Pull it from the oven as soon as it springs back lightly and the center is set.
- Watch temperatures for perfect texture: The ganache should be spreadable, not runny; the glaze should be just warm and fluid. If either is too hot, it will soak into the cake or run off.
- Keep mascarpone cool: Cold mascarpone and cream whip into a smooth, stable cream. Overbeating or using warm mascarpone can cause graininess.
- For razor-sharp slices: Chill the finished cake thoroughly and always cut with a hot, dry knife, wiping the blade between cuts.
Variations
- Yuzu or citrus twist: Replace half the water in the vanilla syrup with yuzu juice, lemon juice, or a mix of citrus juices for a bright, gently tangy contrast to the white chocolate and vanilla.
- Berry layer: Spread a very thin layer of strained raspberry or strawberry jam over one of the soaked sponge layers before adding the vanilla cream for a Franco–Japanese pâtisserie feel.
- Less-sweet version: Swap half of the white chocolate in the ganache for high-quality milk chocolate and omit the matcha in the glaze, finishing with a pure white top and a light dusting of matcha only as garnish.
Storage & Make-Ahead
This gâteau opéra revisit matcha–vanille keeps very well. Store the finished cake, tightly covered, in the refrigerator for up to 3 days. For the cleanest slices, cut it while cold and bring to the table still nicely chilled; the creamy layers will slowly soften as you eat.
You can break the work into stages: bake the sponge and make the vanilla syrup up to 2 days ahead (wrap the sponge well and refrigerate). The white chocolate ganache and vanilla cream can be prepared a day in advance; let the ganache soften briefly at room temperature and gently re-whip the cream layer if needed before assembling. The assembled, unglazed cake can be refrigerated for up to 24 hours, then glazed on the day you plan to serve it.
The fully assembled and glazed cake also freezes surprisingly well. Freeze on a tray until firm, then wrap tightly and freeze for up to 1 month. Thaw overnight in the refrigerator, then trim and slice.
Nutrition (per serving)
Approximate values per slice (1 of 10): about 680 calories, 9 g protein, 55 g carbohydrates, 47 g total fat, 29 g saturated fat, 200 mg sodium, 42 g sugars. These numbers are estimates and will vary with exact ingredients and portion sizes, but they give a good sense of how rich and celebratory this dessert is.
