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Just like the biscuits but better.
Heat 355/180 degrees.
Cream together the Butter & icing sugar.
Gradually add the flour & custard powder until incorporated.
Place tbsp of mixture onto a tray.
Bake for 10-12 mins.
Mix together icing sugar & butter.
Sandwich the biscuit & filling together.
Cook along with #CookingSuperstar Emma from Casserole Et Chocolat