CUSTARD CREAMS

Steps:

• Make the biscuits:
• Sift the flour, custard powder, powdered sugar, and baking soda into the mixing bowl of a stand mixer fitted with a paddle attachment. Slowly add the butter, one cube at a time. Scrape down the sides of the bowl from time to time and continue to mix until a smooth dough is formed.
• Remove the dough from the fridge 15 minutes before rolling it out, and preheat the oven to 325°F/170°C/150°C fan/Gas Mark 3. Use a rolling pin to roll the dough out to roughly ⅛-inch/3mm thick. Use a 6cm pastry cutter to cut 20 rounds from the dough, and transfer the rounds to two baking sheets lined with baking parchment, leaving 1cm between the rounds. Bake the biscuits for 10 minutes. They will look slightly golden, but it's important that they don't take on much colour. Allow the biscuits to cool on the sheets for a couple of minutes, then carefully transfer them to a wire rack to cool completely.
• Make the filling and assemble:
• Meanwhile, put the butter and powdered sugar for the filling into the bowl of a stand mixer fitted with a paddle attachment. Beat until smooth, then add the vanilla paste and beat again. Scrape down the sides and continue to mix until the vanilla is incorporated. Use a spatula to transfer the mixture to a disposable piping bag. Cut a ½ cm hole in the pointed end of the piping bag and pipe spirals of the icing on 10 of the biscuits, leaving ½cm between the filling and the outside edge of the biscuit. Carefully place an un-iced biscuit on top of an iced one and repeat with the remaining iced and un-iced biscuits - there will be 10 filled custard creams in total.
• Store in an airtight container in a cool spot for up to 5 days.