Preheat your oven to 400°F and line a baking sheet with parchment paper for easy cleanup.
Pound the chicken breast to an even half-inch thickness to ensure it cooks uniformly.
Whisk the egg in a shallow bowl until the yolk and white are fully combined.
In a separate shallow dish, mix the panko breadcrumbs, parmesan cheese, garlic powder, oregano, sea salt, and black pepper.
Dip the chicken breast into the egg wash, then press it firmly into the breadcrumb mixture to coat both sides thoroughly.
Place the coated chicken on the prepared baking sheet and drizzle the olive oil over the top.
Bake for 15 minutes, then remove the tray and spoon the marinara sauce over the chicken.
Top the sauce with the shredded mozzarella cheese and return to the oven for 5 to 7 minutes until the cheese is bubbly.
Garnish with freshly chopped basil before serving hot.