Heat oven to 200C/180C fan/gas 6.
Line 1-2 baking sheets with baking
parchment. Mix the sugars and butter
together with a wooden spoon, then add
the egg, vanilla, flour and half the melted
milk chocolate and mix together. Stir in
the white and plain chocolate chips or
chunks, then use an ice-cream scoop or
round tablespoon (like a measuring spoon)
to scoop out balls of cookie dough and
drop them straight onto the trays.
Bake in batches for 8-9 mins until pale
golden and still soft to touch – they will
firm up as they cool. Carefully transfer to
a wire rack as soon as they can be lifted
up, then drizzle with the remaining