Cookie Cake

165g unsalted butter (1 1/2 sticks), melted and cooled until warm
1 cup packed light or dark brown sugar (7 ounces)
1/2 cup white sugar (3 1/2 ounces)
1 egg
1 egg yolk
1 tsp vanilla extract
2 cups + 2 tbsp plain flour (10 1/2 ounces)
1/2 tsp baking soda
1/2 tsp salt
1  cup chocolate chips or chunks (milk or dark)
Preheat the oven to 180 C (350 F) and line a 9 inch springform tin with baking paper.
In a large bowl, beat the melted butter and sugars with a wooden spoon until smooth.
Add the vanilla, egg and egg yolk, mixing well between each addition.
Mix in the flour, baking soda and salt until incorporated. Stir in the chocolate chips.
Put all the dough into the tin and press it in evenly with your hands.
Bake for 15 – 20 minutes, until the edges are golden and the center just set. Serves 10.