Cream the sugar and butter together until soft and creamy, this does take a while!
Fold in the flour, custard powder and the vanilla essence until a dough is formed. (I made mine in my food processor)
Lightly dust a clean surface with flour, and roll out dough to roughly ½ cm thickness. Then cut out shapes of your choice, I did rounds (using a scone cutter). You need to make an equal amount
Place on to your prepared baking tray and bake in the oven for 8-10minutes until golden brown.
Remove and cool on the tray and then move to a cooling rack.
*Make the filling*
Place the butter into a mixer and beat to soften and then add icing sugar, custard powder and vanilla until a creamy consistency is achieved. Now stir in the sprinkles - about ½ tbsp is plenty
Put the buttercream into an icing bag
By now your biscuits are cooled and ready to fill and decorate. You should HAVE enough for approx 6 pairs (12 rounds).
Mix the icing sugar with some cold water - enough to make a runny icing that is not too thin.
Take the top biscuit and dip into the icing (or spread it on with a knife) and then add some sprinkles to stick to the icing. Leave for 5 minutes to set
Turn one of the biscuits over and pipe the buttercream into the centre. Repeat for the other 5 biscuits. Then top with the corresponding top biscuits and press down gently so the cream filling fills the middle.
Your funfetti custard creams are ready to eat!
Keep in a sealed tin.
Recipe by Mummy Mishaps at http://www.mummymishaps.co.uk/2018/08/funfetti-custard-creams-gbbo-2018-week-1-biscuits.html