Line a Sheet Pan with a Sheet Pan Liner, brush with a little oil.
Stir together the breadcrumbs, Parmesan, seasoning, and salt and pepper, if desired.
Dip each chicken piece in the breadcrumb mixture, patting to coat thoroughly on both sides. Place on the prepared baking sheet.
Bake the chicken until the breadcrumbs have browned and the chicken is almost entirely cooked through, about 15 min.
Remove the sheet pan from the oven. Top each chicken piece evenly with marinara sauce and divide mozzarella on each, return to the oven. Bake until the cheese is melted and bubbly, an additional 10 min. Serve hot.