Preheat oven to 400 °F (200 °C). Line a baking sheet with parchment paper or lightly grease it.
Set up breading stations: place flour in one shallow bowl; beat eggs in a second; mix breadcrumbs, Parmesan, garlic powder, oregano, salt, and pepper in a third.
Dredge each chicken tender in flour (shake off excess), dip in egg, then coat thoroughly in breadcrumb mixture. Press crumbs to adhere.
Arrange breaded tenders on the prepared baking sheet. Drizzle or spray lightly with olive oil.
Bake in preheated oven for 12–15 minutes, until golden and cooked through (internal temp 165 °F/74 °C).
Remove from oven; spoon marinara sauce evenly over each tender, then sprinkle with mozzarella cheese.
Return to oven and bake 3–5 minutes more, until cheese is melted and bubbly.
Garnish with chopped parsley or basil if desired, and serve hot—perfect with pasta, salad or as standalone bites.