If you have plain flour but no self-raising flour, you can make your own by adding 2 teaspoons of baking powder to every 150g plain flour. Sift it through to ensure the baking powder is evenly ...

With the processor still running, add 3 large eggs one by one. Pulse in 150g plain flour, 1 tsp baking powder and a pinch of sea salt until just combined, then pour the mixture evenly into the tray.