Heat the oven to 190°C/170°C fan/gas 5. In a Cooks Professional 1000W stand mixer with the paddle attachment, cream the butter and sugar together until pale and fluffy. Add the egg and vanilla, then beat until well combined.
Sift over the flour, baking powder and salt, then beat again briefly to combine. Stir in the chocolate chips using a wooden spoon or spatula, then spoon the dough into a Cooks Professional Cast iron pan and press down gently to flatten and spread evenly to the edges. Bake for 25-30 minutes until risen and golden. Top with scoops of ice cream, then dig straight in with your spoons!
