preheat oven to 180
beat butter and sugars until pale and creamy, add egg and whip well.
mix in flour and baking soda and chocolate chips, stir until well combined, turn into lined slice tray (mine is 20×20 i think) and bake for 15 mins (this is a lie, i usually do it for about 20-25).
don’t skewer test it, it won’t set, it is kind of fudgy like a brownie. once i cooked it until it was totally done and it was dry and gross.
50g soft butter
125g icing sugar
1/4 c cocoa
cream or milk to mix
whip together until icing is a consistency of your liking, spread over the top.
i like it with a thin icing, but you could double it if you wanted (use 1/3 c cocoa not 1/2). throw some choc chips on the top if you want. also freezes well.