Preheat the oven to 375°F (190°C). Line a cookie sheet with parchment paper.
In a shallow bowl, whisk together the egg and milk until combined.
In another shallow bowl or pie plate, mix the Italian bread crumbs and grated Parmesan until evenly combined.
Working in batches, dip each thawed ravioli into the egg mixture, letting excess drip off, then press into the bread crumb mixture to coat both sides.
Place the coated ravioli in a single layer on the prepared cookie sheet. Repeat until all ravioli are coated.
Lightly spray the tops of the ravioli with cooking spray to help them brown.
Bake in the preheated oven for 12–15 minutes, or until golden brown and crispy.
Serve warm with marinara or pesto for dipping.