Preheat the oven to 375°F (190°C) and spray a baking sheet lightly with nonstick cooking spray.
Cook the refrigerated cheese ravioli according to package directions, drain in a strainer, and set aside to cool slightly.
In a shallow bowl, combine the panko, Italian seasoning, and grated Parmesan; stir to mix evenly.
Place the slightly beaten egg white in another shallow bowl.
Dredge each ravioli first in the egg white, letting excess drip off, then press into the panko mixture so both sides are well coated.
Arrange the coated ravioli in a single layer on the prepared baking sheet, spray the tops lightly with nonstick cooking spray, and bake until the coating is light golden brown, about 10–12 minutes.
Warm the marinara sauce, then serve the baked ravioli hot alongside the sauce for dipping.