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Vanilla Custard Slice

An indulgent yet straightforward dessert, this vanilla custard slice combines velvety custard with crisp layers of puff pastry, crowned with a smooth vanilla glaze. Perfectly suited for afternoon tea or a sweet conclusion to any meal.
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Prep Time 15 minutes
Cook Time 15 minutes
Total Time 30 minutes

Ingredients
  

  • 1 cup milk
  • 2 teaspoons vanilla bean paste or vanilla extract
  • 1 ½ cups caster sugar 315g
  • 2 sheets frozen butter puff pastry thawed
  • 1 cup custard powder 135g
  • 4 cups thickened cream

For the icing:

  • 2 teaspoons softened butter at room temperature
  • Milk or water as needed
  • 1 –2 teaspoons vanilla bean paste or vanilla extract
  • 2 cups icing sugar

Instructions
 

  • Preheat the oven to 190°C (374°F) and arrange the puff pastry sheets on a baking tray lined with parchment. Prick each sheet thoroughly with a fork to prevent excessive rising. Bake for 10–15 minutes until they become puffed, golden, and flaky. Allow to cool completely on a wire rack.
  • While the pastry bakes, whisk the custard powder and caster sugar together in a large saucepan. Gradually incorporate the milk, cream, and vanilla, whisking until smooth. Place the saucepan over very low heat and stir constantly until the custard thickens substantially, which can take 10–15 minutes.
  • Once thickened, pour the hot custard into a bowl. Cover directly with plastic wrap to avoid forming a skin and refrigerate for 1–2 hours until mostly firm.
  • To prepare the icing, combine icing sugar, softened butter, and vanilla in a mixing bowl. Add milk or water slowly—1 tablespoon at a time—until a thick, spreadable consistency is achieved.
  • To assemble, place one pastry sheet in a 25 x 25 cm square tin or on a flat serving board. Evenly spread the chilled custard over the base. Position the second sheet of pastry on top and gently press. Smooth the icing over the top using a flat knife or spatula.
  • Cover and refrigerate for at least 4–6 hours, preferably overnight, to set completely. When ready to serve, use scissors or a serrated knife to carefully cut through the top pastry layer, followed by a sharp knife for the remainder.

Notes

Use butter puff pastry for optimal flavor and texture. Custard powder should be measured precisely for a set filling. Whisk continuously over low heat to avoid burning. Assemble in a lined tin to help maintain structure while setting. Store slices in the fridge in an airtight container for up to 3 days. Slice cold for clean portions.