Place your gluten-free puff pastry on a baking tray lined with baking paper. Use a fork to poke holes all over it to stop it from puffing up.
Put another sheet of baking paper on top, then place another tray on top to keep it flat.
Bake for 15–20 minutes or until it looks golden and feels crispy. Let it cool down, then cut it into two equal squares or rectangles to fit your slice tin.
Add the milk, cream, and vanilla into a saucepan and set it over medium heat. Warm it up until it’s steaming, but be careful not to let it boil.
While that’s heating, grab a mixing bowl and whisk together the sugar, cornflour, plain flour, and egg yolks until smooth.
Once the milk mixture is hot, slowly put it into the mixture while whisking constantly. This step is essential—it helps warm up the eggs gently so they don’t scramble.
Pour everything back into the saucepan and keep whisking over medium heat. After about 5 to 8 minutes, it should thicken into a smooth custard.
Now leave it from the heat and stir in the butter until it’s completely melted and the custard is silky smooth.
Line your slice tin with baking paper, ensuring that some hang over the edges so you can easily lift it out later.
Put one sheet of puffy pastry flat on the base of the tin.
Carefully pour the warm custard over the pastry, spreading it evenly to cover the surface.
Lay the second sheet of pastry on top and press it down lightly to hold everything in place.
Cover the tin and place it in the refrigerator for at least 3–4 hours, or overnight, until the custard has set.
In a mixing bowl, combine icing sugar with just enough milk to make a thick but smooth icing that’s easy to spread.
For an extra flavor, you can stir in a little vanilla extract or some passionfruit pulp, if you prefer.
Once the slice has set, gently spread the icing over the top layer of pastry.
Pop it back into the fridge for another 20–30 minutes so the icing can firm up.
Cut the slice into four equal parts. Serve and enjoy
Servings 4
* Percent Daily Values are based on a 2,000 calorie diet. Your daily value may be higher or lower depending on your calorie needs.
Craving more gluten-free bakes? Head over to our Delicious Gluten-Free Biscuits Recipes – Bake With Confidence post for more easy, crowd-pleasing ideas.