It was fun trying this, and it saves a lot of time when baking for several people, but I still prefer the texture of the individual cookies.
Chocolate chip cookie cake, serves 10
170 g butter
300 g flour
1/2 tsp bicarbonate of soda
1/2 tsp salt
210 g brown sugar
100 g sugar
1 egg yolk
1 tbsp vanilla extract
170 g chocolate (I mixed dark and milk)
Melt the butter. Mix flour with bicarb and salt in a bowl. Stir together both sugars with the melted butter. Beat in the egg, the egg yolk and the vanilla extract, until the mixture turns light and fluffy. Stir in the flour mixture, and finally the chocolate.
Butter a 23 cm springform and press the mixture into the dish, evenly. Bake at 165°C for 20-30 minutes.