Rub the butter into the flour to make
crumbs, then stir in sugar, vanilla, yolks
and chocolate chips and bring together
to form a dough. Roll out on a lightly
floured surface and stamp out 6cm round
biscuits. Re-roll the trimmings and
repeat. Arrange on parchment-lined trays
and chill for 30 mins.
Heat oven to 200C/180C fan/gas 6.
Bake biscuits for 10-12 mins until golden.
Cool. Spread each with white chocolate
and leave to set. Decorate, or write on
buyer’s name with red icing on the spot,
if you like.