Preheat the oven to 150°C (fan) and line a baking tray with baking parchment.
Empty the biscuit mix into a bowl and add the butter. Use your fingertips to rub the butter into the dry ingredients until it comes together into a shortbread dough.
On a lightly floured surface, roll the shortbread dough out to approximately 0.5cm. Use a knife to cut the shortbread into a rectangle.
Chill in the fridge for 30 minutes.
Bake for 15 minutes until golden.
Set aside and leave to cool completely.
Decorate the shortbread:
Mix the icing sugar with 1 tsp of cold water at a time until it’s smooth, thick but still spreadable.
Spread the icing over the shortbread.
Use the blue and red sprinkles to make a Union Jack pattern on top of the icing.
Serve and enjoy!
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