You can have this in you oven within about 5 - 10 minutes and in your tummy in about 45 minutes.
So it is a good recipe to keep for when you have unexpected guests or just what something to eat with your cuppa.
Melt and Mix Shortbread
250 gm unsalted butter , melted, 360 gm plain flour, 40 gm custard powder, 55 gm caster sugar, 35 gm icing sugar
Preheat oven to 180.c. Line a 18 x 28 cm (7" x 11") tin with baking paper.
In a large bowl place all the dry ingredients, mix together with a wooden spoon. Add the melted butter, stir until it is well mixed together. Place into the tray and using your hand, the best piece of equipment, flatten in the tray.
I then use a spatula to make the surface smooth, then cut into slices and using a fork prick each piece.
If you want to make them even more special you can sprinkle them before baking with a little bit of caster sugar.
Bake 20 - 30 minutes, depending on your oven, until lightly golden. Remove from the oven but leave to cool in the tray. While still hot recut into slices. When cold remove from tray and store in an airtight container.