Preheat and prep: Heat your oven to 425°F (220°C).
Line a sheet pan with parchment or lightly oil it to prevent sticking.
Mix the crust: In a bowl, combine Parmesan, panko, olive oil, garlic powder, onion powder, paprika, lemon zest, parsley, salt, and pepper. Stir until the crumbs are evenly coated and slightly moistened.
Optional spread: For extra adhesion and richness, lightly brush the top of each tilapia fillet with a thin layer of mayonnaise or Greek yogurt.
Coat the fish: Place the fillets on the prepared pan. Press the Parmesan breadcrumb mixture firmly onto the top of each piece, dividing it evenly.
Aim for a compact, even layer.
Bake: Cook for 10–14 minutes, depending on thickness, until the crust is golden and the fish flakes easily with a fork. Thicker fillets may need an extra minute or two.
Finish and serve: Squeeze fresh lemon over the hot fillets. Taste and add a pinch of salt if needed.
Serve immediately with your favorite sides.