Heat the oven: Preheat to 425°F (220°C).
Line a baking sheet with parchment paper or lightly oil it so the fish doesn’t stick.
Mix the coating: In a bowl, combine Parmesan, breadcrumbs, garlic powder, paprika, Italian seasoning, lemon zest, a pinch of salt, and pepper. Stir to blend.
Prep the tilapia: Pat the fillets very dry with paper towels. Brush both sides with a thin layer of olive oil, then brush the top side with beaten egg.
The egg helps the coating cling and crisp.
Coat generously: Press the Parmesan-breadcrumb mixture onto the top of each fillet. Don’t coat the bottom; keeping it bare helps the fish cook evenly and prevents sogginess.
Bake until golden: Arrange fillets on the prepared sheet, coating side up. Bake for 10–12 minutes, depending on thickness.
The fish should flake easily and the coating should be lightly browned.
Optional broil: For deeper color and extra crunch, switch to broil for 1–2 minutes at the end. Watch closely—Parmesan can go from golden to too dark in seconds.
Finish and serve: Squeeze fresh lemon over the fish and sprinkle with parsley. Serve hot with a simple salad, roasted vegetables, rice, or garlic mashed potatoes.