In a large deep dish add the flour, panko, cornflakes, corn starch, paprika, 1 tsp salt and pepper, stir together and set aside. In another large deep dish add the egg, milk and whisk until smooth.
Place the boneless chicken breast between two sheets of cling wrap or baking paper. Using a rolling pin or a meat tenderizer beat the fillets to flatten them and even out the thickness. Repeat the process with all the pieces of chicken and remove the cling wrap/baking paper.
In a skillet on medium heat add the vegetable oil and let it get hot while you coat the chicken fillets.
Dunk the chicken fillets into the milk mixture and then into the dry flour mixture, pat down the fillets into the dry mixture to ensure it is even coated. Place in a tray and repeat the process with the remaining cutlets.
Fry the cutlets for 3 minutes on each side and make sure it is cooked through, if you cut into it the meat should be white and the juices should run clear.
Place on kitchen paper towel and allow the excess oil to drain out. Repeat with the other cutlets.
In a baking tray place the fried cutlets, top with mozzarella cheese and place under the broiler in the oven. Cook until the cheese has melted and has a little color.