Trim the chicken into equal finger-sized portions. Mix the flour and paprika together and spread onto a plate. Put the egg into a bowl and beat with a splash of water. Spread the cornflakes onto a separate plate.
Dip the chicken in the flour, next coat with the egg, then cover completely in the crushed cornflakes. Set aside, well covered, in the fridge until you want to cook.
Heat the oven to 200C, gas 6. Heat the oil in a frying pan. Once hot, add the chicken and fry for 3-4mins each side until golden and crispy. They will cook more evenly if you do this in batches. Arrange the chicken on a baking tray, lined with baking parchment, and finish cooking in the oven for around 5 mins.