Cookie/cookie pie 200 g unsalted butter 225 g light brown soft sugar 100 g white granulated sugar 1 medium egg 1 egg yolk 1 tsp vanilla 425 g plain flour 1 tsp baking powder 1.5 tsp bicarbonate of soda 1/2 tsp sea salt 300 g chocolate chips (save some for the top) #recipe #cookiepi