In a shallow dish, mix together cereal and breadcrumbs and Parmesan; set aside.
Tenderize and flatten chicken by placing between waxed paper and pounding lightly with meat mallet. Pour egg in a shallow dish. Dip chicken into eggs followed by cereal crumb mixture. Repeat to coat chicken a second time in both egg and crumb mixture for an extra crispy coating.
Spread half of the marinara sauce onto the bottom of a 4L /13-x
9-inch baking dish; set aside.
Heat half of the olive oil in a large frying pan over medium-high heat. Brown half of the chicken on both sides and transfer to prepared baking dish. Repeat with remaining oil and chicken. Top with remaining sauce and sprinkle with cheese.
Bake at 180°C (350°F) for 20 minutes or until chicken is cooked through, sauce is hot and bubbling, and cheese is melted and golden.