Gâteau Basque

Gâteau Basque is a French cake with two shortbread layers, a pastry cream or chocolate filling, and a distinctive cross-hatch pattern on top. It is tender, rich, and not overly sweet, with the filling that stays creamy even after baking.

Ingredients for Gâteau Basque

All-purpose flour makes the pastry sturdy enough to hold its shape and creates a tender crumb. Butter (cold for the dough, room-temperature for the cream) gives richness and structure. Egg yolks bind the pastry and enrich it, while whole eggs go into the pastry cream to thicken and emulsify it. Granulated sugar sweetens both the dough and the cream. Vanilla extract adds depth without competing with the filling. Baking powder gives gentle lift. Salt balances sweetness and brings out flavor. Whole milk and a vanilla bean (or more extract) infuse the pastry cream with warmth. Cornstarch thickens the cream so it sets properly in the oven’s heat. An egg beaten with water glazes the top and browns it.

Why This Gâteau Basque Works

The pastry is a shortbread dough that bakes up tender and golden because cold butter stays in small pieces as it goes into the oven, creating a crumbly texture. Pressing it into the pan and chilling it prevents shrinking and keeps the edges crisp.

The pastry cream is thickened with cornstarch and egg, so it sets up firmly enough to slice cleanly without leaking out of the cake, even as the filling warms during baking. Spreading the cream in an even layer and not overfilling prevents the sides from bursting.

The egg wash on top browns in the oven and the cross-hatch pattern, cut into it before baking, becomes a visual signature. The whole cake bakes at a moderate temperature long enough for the pastry to turn golden and crisp while the filling stays creamy.

Mistakes To Avoid

Overmixing the pastry dough makes it tough and dense. Mix just until the dough comes together when you squeeze it, then stop. If it looks slightly shaggy, that is fine.

Skipping the chill step before baking causes the pastry to shrink away from the sides of the pan and become thin and dry. A 30-minute chill firms up the butter so it stays in place.

Spreading warm or thin pastry cream onto the bottom layer causes it to leak out the sides as the cake bakes. Make sure the cream is thick and chilled, and do not overfill.

Cutting into the cake while it is hot breaks apart the pastry and smears the filling. Let it cool for at least 2 hours in the pan so everything sets and firms up enough to slice cleanly.

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Ingredients

• 1 3/4 cups (220 grams) all-purpose flour
• 1/2 cup (115 grams) cold butter, cut into small cubes
• 2 egg yolks
• 1/4 cup (50 grams) granulated sugar
• 1 teaspoon vanilla extract
• 1/2 teaspoon baking powder
• 1/4 teaspoon salt
• 1 cup whole milk
• 1 vanilla bean, split lengthwise and seeds scraped (or 1 teaspoon additional vanilla extract)
• 3 whole eggs
• 1/2 cup (100 grams) granulated sugar
• 3 tablespoons cornstarch
• 4 tablespoons (60 grams) butter, room temperature
• 1 egg, beaten with 1 tablespoon water, for egg wash

Step-by-step Instructions

1. Mix flour, baking powder, and salt in a bowl. Add cold butter and pinch it into the flour with your fingertips until the mixture looks like coarse breadcrumbs with pea-sized pieces of butter still visible.
2. Whisk together egg yolks, sugar, and vanilla extract in a small bowl, then add to the flour mixture. Stir gently until the dough just comes together when squeezed. Divide in half, shape each into a disk, wrap in plastic, and refrigerate for 30 minutes.
3. Heat milk with vanilla bean seeds (or extract) in a medium saucepan over medium heat until steaming, about 5 minutes. Do not boil.
4. Whisk together whole eggs, sugar, and cornstarch in a bowl until pale and thick, about 2 minutes. Slowly pour the hot milk into the egg mixture while whisking constantly to avoid scrambling the eggs.
5. Return the mixture to the saucepan and cook over medium heat, whisking constantly, until it thickens and reaches 160°F (71°C) on an instant-read thermometer, about 5 to 8 minutes. Remove from heat, stir in room-temperature butter, and let cool to room temperature, stirring occasionally, about 20 minutes.
6. Preheat oven to 350°F (175°C). Press one disk of dough evenly into a 9-inch round cake pan, covering the bottom and coming up the sides slightly.
7. Spread the cooled pastry cream evenly over the bottom pastry layer, leaving a thin border.
8. Roll out the second dough disk between two sheets of parchment to fit the top of the pan, then slide it onto the filling and press gently to seal the edges. Trim any overhang with a knife.
9. Brush the top with egg wash. Using a sharp knife, score a cross-hatch pattern into the surface, cutting only into the top pastry layer, not all the way through.
10. Bake at 350°F (175°C) until the pastry is deep golden brown, 45 to 50 minutes. The filling will firm up as it cools. Let the cake cool completely in the pan, at least 2 hours, before slicing.