Personal Gâteau Basque with Cinnamon Apple Filling and Vanilla Mascarpone Cream

Gâteau Basque is a sturdy, golden Basque Country classic — a buttery, slightly dense shortcrust cake with deep roots in the French Basque Country. This two-serving version bakes as a solid, dense-tender, cookie-like cake with a crisp golden crust and a chewy, almond-scented crumb, now filled with a thick, jammy cinnamon apple filling pressed into a well in the dough. Topped with a cloud of vanilla bean whipped mascarpone cream, it's a deeply satisfying and warmly spiced take on the original.

Ingredients

• unsalted butter, softened – 7 tablespoons
• granulated sugar – ½ cup
• large egg yolks (save whites for egg wash) – 2 yolks
• small whole eggs, at room temperature – 2 small whole eggs
• all-purpose flour – 1½ cups
• almond flour – 6 tablespoons
• baking powder – ⅛ teaspoon
• fine salt – ¼ teaspoon

• cinnamon apple filling, thick and jam-like (if yours is loose or syrupy, reduce it in a saucepan first until it mounds on a spoon) – 2 to 3 tablespoons per cake (4 to 6 tablespoons total)

• reserved egg whites from dough, lightly beaten – 2 egg whites

• mascarpone cheese, cold – 6 tablespoons
• heavy cream, cold – 6 tablespoons
• powdered sugar – 2 teaspoons
• vanilla bean paste or pure vanilla extract – ½ teaspoon

Instructions

1. Make the cake dough. In a medium bowl, beat 7 tablespoons (100g) softened butter and ½ cup (100g) granulated sugar together with a wooden spoon or handheld mixer until pale and fluffy, about 2 minutes. Add the 2 egg yolks and the 2 whole eggs and beat until fully incorporated — the mixture will look slightly loose, which is fine.
2. Add 1½ cups (190g) all-purpose flour, 6 tablespoons (48g) almond flour, the baking powder, and salt, and mix just until the dough comes together — it will be softer and stickier than a classic shortcrust; this is correct. If it feels unworkably wet, add 1 teaspoon (3g) additional all-purpose flour at a time. Wrap the dough tightly in plastic wrap and refrigerate for at least 30 minutes — or up to 1 hour — to firm up.
3. Preheat your oven to 375°F / 190°C (convection: 350°F / 175°C). Lightly butter two 4-inch (10cm) round springform or cake pans. Divide the chilled dough evenly between the two pans and press it into a single solid layer about ½-inch thick in each, leaving a raised border of dough around the edge — about ½ inch (1.25cm) wide — to contain the filling. Using your fingers or the back of a spoon, press a shallow well into the center of each cake. Spoon 2 to 3 tablespoons (30–45g) of your cinnamon apple filling into each well, spreading it to the inner edge of the dough border but keeping it away from the pan sides. The filling should sit just below the top of the border — do not overfill, or it will bubble over and prevent a clean golden crust.
4. Lightly beat the reserved egg whites and brush an even layer over the exposed dough border of each cake only — avoid getting egg wash on the apple filling, as it will scorch during baking. Using the tines of a fork, drag a crosshatch or spiral pattern across the dough border — this is the classic Gâteau Basque decoration.
5. Bake for 35 to 40 minutes, until the dough border and exposed top are deep golden brown and the dough surrounding the filling feels set and firm — a toothpick inserted into the dough border (not the filling) should come out clean. The filling will be bubbling at the edges; that's fine. Let the cakes cool in their pans for 15 minutes before unmolding — the extra rest helps the filling firm up slightly so the cakes hold their shape cleanly. Then transfer to a wire rack and cool to room temperature.
6. While the cakes cool, make the vanilla mascarpone cream. In a cold bowl, combine the cold mascarpone, cold heavy cream, powdered sugar, and vanilla bean paste. Beat with a handheld mixer on medium speed until the mixture holds soft, pillowy peaks — about 1 to 2 minutes. Watch it closely; mascarpone cream can go from silky to grainy quickly if overbeaten. Refrigerate until ready to serve.
7. Serve the cakes at room temperature or slightly warm. Spoon or dollop the vanilla mascarpone cream generously on top of each just before serving — not baked in, not stirred down, just a cool, lush contrast to the warm, buttery cake and spiced apple filling beneath.