Pre-heat the oven to 160°C and spray a baking tray with low calorie cooking spray. Place the Doritos and spices into a food bag and smash until they are nearly all in a fine crumb, but some larger pieces remain
Ensure the chicken breasts are dry. Dust lightly with the cornflour. Break the egg into a dish and dip each chicken breast into it
Put the chicken breasts onto the baking tray and sprinkle over the spice and Doritos mix, ensuring both sides of the chicken is coated thoroughly. Spray liberally with low calorie cooking spray and bake in the oven for 25 minutes
After 25 minutes, turn the chicken and spray with low calorie cooking spray again. Bake for a further 15 minutes until the chicken is completely cooked through and golden