Preheat your oven to 400°F and line a baking sheet with parchment paper.
Pound the chicken breast to an even thickness of about half an inch for uniform cooking.
In a shallow bowl, whisk the egg; in a second bowl, combine panko, parmesan, garlic powder, oregano, salt, and pepper.
Dip the chicken into the egg wash, then press firmly into the breadcrumb mixture until fully coated.
Place the chicken on the baking sheet, drizzle with olive oil, and bake for 15 minutes.
Remove from the oven, spoon the marinara sauce over the chicken, and top with shredded mozzarella.
Return to the oven for 5 to 7 minutes or until the cheese is bubbly and golden brown.
Garnish with freshly chopped basil before serving.