Pour into a 23 cm (9″) sq. silicone mould or lined cake tin and bake at 180℃ (350℉, Gas 4) for 20 minutes when there should no longer be a wobble, but the batter is still fudgy.
Remove from the oven and allow to cool in the pan. Cut into 16 squares.
Notes
Please note: calories and other nutritional information are per serving. They're approximate and will depend on exact ingredients used.