Preheat oven to 400°F and line a baking sheet with foil.
Drizzle the tilapia with olive oil.
Mix the grated Parmesan, lemon pepper, parsley, and salt together.
4 (4-ounce) tilapia filets, ¾ cup freshly grated Parmesan cheese, ⅛ teaspoon kosher salt, 1 tablespoon lemon pepper seasoning, 1 tablespoon chopped fresh parsley
Coat with the cheese mixture, pressing it in lightly with your fingers to make sure it sticks.
1 tablespoon olive oil, ¼ cup freshly shredded Parmesan cheese
Sprinkle lightly with the shredded Parmesan.
Bake in the preheated oven until the fish is opaque in the thickest part, about 10 minutes.
To brown further, broil for about 5 more minutes until cheese crust is slightly crispy (watch carefully to make sure fish doesn't burn).
Top with green onions and serve and serve with lemon wedges, optional.
¼ cup diced green onions, 1 lemon