Golden Cube Croissant with Vanilla Bean Diplomat Cream Step-by-step instructions

Before you start

Before starting, ensure the laminated croissant dough is at the right temperature—cold but pliable, typically straight from the refrigerator. Butter the mold generously and set it aside. Prepare the vanilla bean diplomat cream, if not already made, and chill it thoroughly.

Have a piping bag with a plain tip ready. Preheat the convection oven to 380°F (193°C) just before baking. Clear a warm, draft-free area for proofing, such as the top of the refrigerator or a turned-off oven with the light on. Measure all ingredients and gather equipment to streamline the process.

Instructions

Proof and Prepare

1. 1Prepare the Dough and Mold
   Butter the inside of a 10 cm anodized steel cube mold generously, making sure every corner and edge is coated. Place the 180 g laminated croissant dough into the mold, pressing it gently so it fills the bottom and sides evenly. Lock the lid securely to seal the mold completely.
   Look for The dough should fit snugly without overflowing; the mold is sealed shut.
   Tip Use a pastry brush to reach all corners of the mold for even release.
2. 2Proof the Dough
   Let the sealed mold sit in a warm, draft-free spot for 2.5 hours. The dough will slowly rise and fill the cube as it proofs. Keep the mold locked throughout this time so the dough takes on the cube shape.
   Look for After proofing, the dough should feel springy and have expanded to fill the mold.
   Tip A slightly warm oven (turned off) can help maintain a steady proofing temperature.

At the end of this phase, the dough should have risen to fill the cube mold completely, with no gaps in the corners. The mold should feel firm when gently pressed, and the dough should spring back slowly. The butter in the mold should have melted and coated the dough evenly.

The room should smell subtly of yeast and butter. Check that the lid is still securely locked and that no dough is escaping from the seams. This is the stage where the shape is set, so take care not to disturb the mold.

Bake to Golden

3. 3Bake the Cube
   Preheat a convection oven to 380°F (193°C). Place the sealed cube mold on a baking sheet and bake for 22 minutes. The mold will trap steam, helping the layers puff while the exterior turns deep golden brown.
   Look for The cube should be deeply golden and feel firm to the touch when lightly pressed.
   Tip Do not open the oven during baking to avoid temperature fluctuations.
4. 4Unmold and Cool
   Remove the mold from the oven and let it rest for 2 minutes. Carefully unlock and lift the lid, then invert the cube onto a cooling rack. Let the cube croissant cool completely before filling, so the layers set and stay crisp.
   Look for The cube should release easily and hold its shape, with crisp corners.
   Safe temperature 160°F (71°C) internal temperature (egg dishes)
   Tip If it sticks, run a thin knife around the edges to loosen.

After 22 minutes, the cube should be a deep golden brown, almost caramelized in places. The surface should look glossy and slightly cracked, with visible flaky layers. The aroma of baked butter and bread will fill the kitchen. When you tap the top, it should sound hollow, indicating a crisp crust. Let the cube cool on a rack for at least 30 minutes before handling. The corners should be sharp enough to cut cleanly. If the cube is pale or soft, it needs more time in the oven.

Fill and Finish

5. 5Fill with Diplomat Cream
   Fit a piping bag with a plain tip and fill it with the chilled vanilla bean diplomat cream. Insert the tip into the center of the cooled cube and pipe 100 g of cream into the core. The cream should fill the inside without overflowing.
   Look for The cube feels heavier and the cream is visible at the injection point.
   Tip Inject slowly so the cream spreads evenly inside.
6. 6Dust and Serve
   Dust the top of the filled cube croissant with confectioners' sugar using a fine-mesh sieve. Serve immediately while the exterior is crisp and the cream is cool.
   Look for A light, even dusting of sugar covers the golden cube.
   Tip Use a small spoon to catch any sugar that falls onto the plate.

The filled cube should feel heavy and dense when lifted, and the cream should be visible at the injection point. A dusting of confectioners' sugar covers the top, adding a snowy finish. When cut open, the interior should show distinct flaky layers with a creamy center. The cream should be cold and thick, not runny. The cube should hold its shape when sliced, with no crumbling. Serve immediately to enjoy the contrast of crisp pastry and cool cream.

Common mistakes

One common mistake is under-proofing the dough, which results in a dense, heavy cube. The dough should be allowed to proof for the full 2.5 hours, or until it has expanded to fill the mold. Over-proofing can cause the dough to collapse during baking, so watch the time carefully.

Another pitfall is not buttering the mold sufficiently, which can cause the croissant to stick. Be generous with the butter and use a brush to reach all corners. Finally, filling the cube while it is still warm will ruin the texture—always cool completely before piping in the cream.

How to tell it’s done

The cube croissant is done when it is deeply golden brown on all sides and feels firm and crisp to the touch. The internal temperature of the dough should reach at least 190°F (88°C) to ensure it is fully baked. If you insert a thermometer into the center, it should read above 190°F (88°C).

The cube should release easily from the mold, and the corners should be sharp and crunchy. Allow it to cool completely before filling, as filling a warm croissant will cause the cream to melt and the layers to become soggy.

• Egg dishes: 160°F (71°C) in the thickest part