Vanilla Slice with Puff Pastry – Creamy Custard Bakery-Style Treat

There’s something so nostalgic and comforting about a classic vanilla slice.

That flaky golden pastry, rich vanilla custard, and sweet glaze take me straight back to my favorite childhood bakery.

This version is made even easier with store-bought puff pastry, but the results taste like they came straight from a pâtisserie case.

Why I Love This Recipe

Bakery-quality at home

Silky smooth vanilla custard

Crisp, flaky pastry layers

Simple, store-bought shortcuts

Perfect for making ahead for guests

What You’ll Need (Ingredient Highlights)

Puff Pastry – Store-bought sheets save time and deliver amazing flakiness.

Milk + Egg Yolks – The rich, creamy base for your custard.

Cornstarch – Thickens the custard to sliceable perfection.

Vanilla Extract – For that warm, classic flavor.

Powdered Sugar + Milk – A smooth vanilla glaze to finish.

Pro Tips Before You Start

Use cold puff pastry for clean rolling.

Bake pastry flat using a fork or a second tray to prevent puffing.

Cook the custard slowly and stir constantly to avoid lumps.

Chill the slice at least 1 hour (overnight is best!) for clean slicing.

Run your knife under hot water before slicing for neat edges.

How to Make Vanilla Slice with Puff Pastry

Step 1. Preheat the Oven

Preheat your oven to 400°F (200°C).

Line a baking dish or tray with parchment paper.

Step 2. Bake the Puff Pastry Base

Dust your surface with flour and roll out one pastry sheet slightly larger than your baking dish.

Transfer it to the lined pan, prick it all over with a fork, and bake for 15–20 minutes until golden and crisp. Remove and let it cool.

Step 3. Make the Custard

In a saucepan, heat the milk just until it starts to simmer.

Meanwhile, whisk together sugar, cornstarch, and egg yolks until smooth.

Slowly pour in the hot milk, whisking constantly.

Return the mix to the saucepan and cook over medium heat, stirring continuously, until thick.

Remove from heat and stir in vanilla. Cool slightly.

Step 4. Assemble the Layers

Place the baked puff pastry base in your dish.

Pour and spread the custard evenly over it.

Roll out the second sheet of puff pastry to match the dish and place it on top.

Gently press to adhere.

Step 5. Make the Glaze

In a bowl, whisk together powdered sugar, milk, and vanilla until smooth.

Adjust consistency as needed with more milk.

Step 6. Finish and Chill

Spread the glaze over the top pastry layer evenly.

Chill in the fridge for at least 1 hour.

Slice into squares or rectangles and serve chilled!

What to Serve It With

A cup of hot tea or espresso

Fresh berries on the side

A dollop of whipped cream

Sprinkle of cinnamon or nutmeg on top

Variations / Substitutions

Use custard powder for a quicker custard.

Add a layer of jam or berry compote under the custard.

Make a chocolate glaze with cocoa powder.

Use plant-based milk and vegan puff pastry for a dairy-free version.

Try a dash of lemon zest in the custard for a citrus twist.

Storage & Leftovers

Keep slices refrigerated in an airtight container.

Best enjoyed within 3 days.

Do not freeze, as the custard texture will change.

Serve chilled — slicing is cleaner after longer chilling time.

Avoid stacking slices to keep the glaze intact.

FAQs

Can I use homemade puff pastry?
Yes! If you have the time, homemade pastry makes it extra special.

Is the custard supposed to be thick?
Yes, it should be thick enough to hold its shape once chilled and sliced.

How long should I chill it before serving?
At least 1 hour, but overnight gives the cleanest slices.

Can I make this ahead of time?
Absolutely! It’s perfect to make a day in advance and refrigerate.

Why is my glaze runny?
You may have added too much milk — just add a bit more powdered sugar to fix it.

Can I flavor the glaze differently?
Yes! Try almond extract, citrus zest, or even a touch of rose water.

How do I get clean slices?
Chill well, and use a hot, sharp knife wiped clean between each cut.

Final Thoughts

This vanilla slice with puff pastry brings joy in every bite — flaky, creamy, sweet, and nostalgic.

It’s a dessert that looks impressive but is incredibly doable, even on a busy day.

Whether for a special brunch or a casual weekend treat, it’s always a hit in my home.

Give it a try and see why it’s a classic favorite across generations.