Mary Berry makes pinwheel biscuits and marbled biscuits on The Great British Bake Off Masterclass.

The ingredients are:

Vanilla biscuit dough, 50g softened butter, 25g caster sugar, 25g cornflour, 50g plain flour, ½ large egg and ½ teaspoon vanilla extract.

Chocolate biscuit dough, 50g softened butter, 25g caster sugar, 25g cornflour, 40g plain flour, ½ large egg and 15g cocoa powder.