Bolg recipes

Nothing says nostalgic bakery comfort food quite like a Classic Vanilla Slice (affectionately known to many as a “snot block” or Mille-Feuille). This iconic treat features thick, velvety vanilla custard sandwiched between layers of perfectly crisp, flaky puff pastry, finished with a generous dusting of powdered sugar.
If you’ve been looking for a foolproof way to recreate this bakery favorite at home with maximum flavor and minimal fuss, this is the recipe for you.

Why This Recipe Works

• The Double-Vanilla Punch: Using both custard powder and real vanilla bean paste creates a deep, aromatic flavor and that classic golden hue.
• Foolproof Thick Custard: The combination of egg yolks, cornstarch-based custard powder, and butter ensures a sliceable custard that holds its shape beautifully without spilling out when you take a bite.
• Effortless Crisp Layers: Using high-quality pre-made puff pastry sheets gives you those sky-high, buttery layers without hours of laminating dough.

Ingredients You’ll Need

• Puff Pastry Sheets: 2 sheets (frozen, thawed)
• Vanilla Custard Powder: ½ cup
• Whole Milk: 2 cups
• Granulated Sugar: ⅔ cup (divided into two ⅓ cup portions)
• Unsalted Butter: 50g (cubed, at room temperature)
• Egg Yolks: 4 large eggs
• Vanilla Bean Paste: 1 tbsp
• Powdered Sugar: For dusting

Step-by-Step Instructions

1. Bake the Puff Pastry

1. Preheat & Prep: Preheat your oven to 400°F (200°C). Line two large baking sheets with parchment paper.
2. Dock the Pastry: Place your thawed puff pastry sheets onto the trays. Prick them all over with a fork (this prevents them from puffing up too unevenly).
3. Bake Until Golden: Place another sheet of parchment paper on top of each pastry sheet, followed by a second baking tray to weight them down slightly. Bake for 15–20 minutes until deeply golden brown and crisp. Remove from the oven and let cool completely.
4. Trim: Trim both sheets to perfectly fit an 8×8 inch (20×20 cm) square baking pan. Place one pastry sheet at the bottom of the lined pan.

2. Make the Rich Vanilla Custard

1. Slurry: In a medium bowl, whisk together the custard powder, 4 egg yolks, and about ½ cup of the cold milk until smooth and lump-free.
2. Heat the Base: In a medium saucepan over medium heat, combine the remaining milk, both portions of sugar (⅔ cup total), and the vanilla bean paste. Bring just to a simmer, stirring to dissolve the sugar.
3. Temper & Thicken: Slowly pour a steady stream of the hot milk mixture into your egg yolk/custard slurry, whisking constantly to prevent the eggs from scrambling. Pour the entire mixture back into the saucepan.
4. Cook until Thick: Whisk vigorously over medium-low heat for 3–5 minutes as it comes to a boil. It will thicken up significantly. Once thick and glossy, remove from heat and immediately whisk in the 50g of butter until completely smooth and melted.

3. Assemble and Chill

1. Pour: Immediately pour the hot vanilla custard over the bottom pastry layer in your lined baking pan. Smooth the top evenly with a spatula.
2. Top: Place the second baked pastry sheet gently on top of the hot custard, pressing down very lightly so it adheres.
3. Chill: Allow the slice to cool to room temperature, then transfer it to the refrigerator for at least 4 hours (preferably overnight) to set completely firm.

4. Slice and Serve

1. Dust: Lift the set vanilla slice out of the pan using the parchment paper handles. Dust the top sheet generously with powdered sugar.
2. The Clean Cut: Use a sharp, serrated bread knife. Wipe the blade clean with a hot, damp cloth between every single cut to ensure beautiful, clean bakery-style edges.

Pro-Tips for the Perfect Slice

Preventing Soggy Pastry: Ensure your pastry sheets are baked until they are a deep golden brown, not pale. A well-baked pastry resists absorbing moisture from the custard, staying crispy for longer.
Getting Clean Cuts: If you struggle to cut through the top layer of pastry without squishing the custard, you can pre-cut the top pastry sheet into squares before placing it on top of the hot custard. When it comes time to serve, just cut straight down through the lines!