Preheat oven to 190ºC/375ºF/Gas mark 5

Lightly grease two baking sheets

In a mixing bowl, cream the butter and sugar until pale & fluffy

Add the egg and vanilla essence and beat well

Sift the flour over the mixture and fold in lightly with a metal spoon

Add the oats and chopped plain & white chocolate and stir until evenly mixed

Place small spoonfuls of the mixture in 18-20 rocky heaps on the prepared baking sheets, leaving space for spreading

https://hisforhomeblog.com/images/cakes_and_bakes/double_chocolate_cookies/double_chocolate_cookie_dough.jpg

Bake for 15-20 minutes until beginning to turn pale golden brown

Leave to cool for 2-3 minutes on the baking sheets then transfer to wire racks to cool completely