Preheat the oven to 400°F / 200°C and combine breadcrumbs, parmesan, garlic powder, and Italian seasoning in a shallow dish.
Dip each chicken breast in beaten eggs, then press into the breadcrumb mixture to coat both sides evenly.
Heat olive oil in a large oven-safe skillet over medium-high heat and sear the chicken for 3 to 4 minutes per side until golden.
Spoon marinara sauce over each chicken breast and top with shredded mozzarella cheese.
Transfer the skillet to the oven and bake for 12 to 15 minutes until the cheese is melted and bubbly and the chicken reaches 165°F / 74°C.
Rest for 3 minutes before serving to let the juices settle and the cheese set.