There’s something undeniably nostalgic about a Classic Vanilla Slice. Layers of crisp, buttery puff pastry sandwiching a smooth, velvety custard, all topped with a dusting of powdered sugar—it’s a bakery favorite that deserves a place in every home baker’s repertoire. Known as custard slice in some regions and closely related to the beloved French mille-feuille, this dessert is an elegant yet simple pleasure.

If you’ve ever admired the golden, flaky layers of a bakery-style vanilla slice, you might be surprised to learn that making it at home is easier than you think. With just a few key ingredients—puff pastry, vanilla custard, and powdered sugar—you can create a dessert that tastes just as good (if not better!) than your favorite pastry shop’s version.

INGREDIENTS YOU’LL NEED

Pastry:

• Frozen butter puff pastry sheets (ensure they’re properly thawed before use)

Vanilla Custard:

• Caster sugar for sweetness
• Corn starch to help thicken the custard
• Egg yolks for a rich, creamy texture
• Heated milk to create a smooth base
• Vanilla bean paste to infuse deep flavor
• Unsalted butter for a silky finish
• Powdered sugar for a delicate dusting

Storage

Refrigerate: Store in an airtight container in the fridge for up to 3 days to keep the pastry crisp and the custard fresh.

Freeze: Not recommended, as the custard may become watery and the pastry soggy when thawed.

Reheat: Best served chilled, but if you prefer a slightly softer texture, let it sit at room temperature for 10-15 minutes before enjoying.

Variations and Substitutions

1. Crust Alternatives: Instead of puff pastry, try using graham crackers, shortbread cookies, or phyllo dough for a different texture.

2. Filling Variations: Swap the traditional custard for a pastry cream, diplomat cream (custard mixed with whipped cream), or even a cheesecake-style filling for a richer taste.

3. Flavored Twists: Add a layer of fruit puree like raspberry, passionfruit, or mango for a fresh burst of flavor. You can also infuse the custard with citrus zest, coffee, or caramel.

4. Dairy-Free Option: Use coconut milk instead of regular milk and dairy-free butter to keep it creamy yet plant-based.

5. Gluten-Free Adaptation: Use gluten-free puff pastry or layer with gluten-free crackers for a similar structure without the wheat.

6. Topping Ideas: Dust with powdered sugar, drizzle with a vanilla glaze, or add a layer of melted chocolate for extra indulgence.

Traditional Vanilla Custard Slice

Yield: 6

Prep Time: 15 minutes

Cook Time: 20 minutes

Total Time: 35 minutes

No Ratings

Print

Ingredients

• Pastry Ingredients:
• Two sheets of frozen butter puff pastry
• Vanilla Custard Ingredients:
• 110 grams caster sugar
• 40 grams corn starch
• 8 egg yolks
• 750 milliliters milk, heated
• 2 teaspoons vanilla bean paste
• 113 grams unsalted butter
• 50 grams powdered sugar

Instructions

For the Pastry:

1. Heat the oven to 150°C (300°F). Place each frozen puff pastry sheet on baking trays lined with parchment paper. Allow them to thaw.
2. Once thawed, use a fork to pierce the surface of each pastry sheet. Cover them with another piece of parchment paper and put a second baking tray on top to weigh them down. Bake for 20 minutes or until they turn golden brown. Let them cool completely after baking.
3. Place a 9-inch square baking tin on one pastry sheet. Use a serrated knife to trim the pastry so it fits the tin’s bottom. Do the same with the second pastry sheet, ensuring it will fit the tin’s top.

For the Vanilla Custard:

1. Mix the caster sugar and corn starch in a large, heat-proof bowl. Add in the egg yolks and whisk thoroughly.
2. Slowly pour in 1/2 cup of the hot milk while whisking constantly. Then, gradually add the remaining milk and the vanilla bean paste, continuing to whisk.
3. Pour the mixture into a large saucepan and cook over medium-high heat, stirring constantly until it thickens (about 5-6 minutes). Take off the heat and mix in the unsalted butter until it's completely melted and combined with the custard.

Assembling the Vanilla Slice:

1. Use parchment paper to line the bottom and sides of the baking tin. Place the first trimmed pastry sheet inside the tin.
2. Pour the custard over the pastry, using a sieve for even distribution. Level the custard's surface with a spatula.
3. Gently lay the second pastry sheet on top of the custard. Chill the assembled dessert overnight in the refrigerator to set.

Cutting and Serving the Vanilla Slice:

1. Remove the set vanilla slice from the tin and place it on a chopping board.
2. With a sharp, serrated knife, gently score the top pastry layer. Cut through the dessert in a single, firm slice, cleaning the knife between cuts.
3. Finish by dusting powdered sugar over the top before serving.