Preheat your oven to 400°F (200°C) and prepare a baking sheet by lining it with parchment paper.
In a mixing bowl, combine the grated Parmesan cheese, breadcrumbs, garlic powder, oregano, salt, and black pepper. Mix well.
Stir in the fresh lemon juice and lemon zest into the breadcrumb and cheese mixture until well combined. The mixture should be slightly moist from the butter and lemon.
Pat the tilapia fillets dry with a paper towel. Brush each fillet on one side with melted butter and then press the buttered side into the Parmesan mixture, ensuring a generous coating.
Place the crusted fillets on the prepared baking sheet with the coated side facing up. Bake in the preheated oven for 12-15 minutes, or until the tilapia flakes easily with a fork and the crust is golden brown.
Remove from the oven, and let it rest for a minute. Garnish with freshly chopped parsley and serve with lemon wedges on the side for an extra burst of citrus flavor.