How can I cook chicken breast like Nando's?
Yes, this technique will give you approximately the same results as Nando's. You want to use an oil with a relatively high burning point like sunflower, rapeseed or groundnut - olive oil may burn.

Another point to remember is that Nando's chicken breasts all have the skin on: this adds flavour and helps keep the meat moist. For the best results, both in terms of not giving yourself food poisoning and avoiding dry chicken, use a quick-read digital thermometer to ensure the breast is only cooked as much as it needs to be, but at a safe internal temperature. It should reach 75ºC in the thickest part.