Ingredients

• 175g butter
• 50g caster sugar
• 50g icing sugar
• 2 egg yolks
• 2 tsp custard powder
• 1 tsp vanilla extract
• 300g plain flour
• Filling
• 100g butter
• 140g icing sugar
• 2 tbsp custard powder
• Yellow food colouring

Method

1. Preheat oven to 180c and line baking sheets
2. Cream together the butter and sugars; add the egg yolks and vanilla extract.
3. Add the flour and custard powder and bring together to form a dough. Wrap in cling film and leave to cool for at least 30 mins.
4. Roll out thinly on a floured surface and cut out. Transfer to a baking sheet and bake for 8-10 minutes until golden.
5. To make the filling, mix the softened butter, icing sugar, custard powder and food colouring. Pipe onto the biscuits once they are completely cool; sandwich together. Dust with icing sugar.