01 - Preheat the oven to 400°F. Lightly grease a baking dish large enough to hold the fillets in a single layer.
02 - Pat the tilapia fillets dry using paper towels. Place them evenly in the prepared baking dish and brush both sides lightly with olive oil.
03 - In a small bowl, whisk melted butter with minced garlic, lemon juice, lemon zest, chopped parsley, salt, and pepper until well incorporated.
04 - Pour the lemon butter mixture evenly over each fillet, ensuring thorough coverage.
05 - Place a slice of lemon atop each fillet to enhance flavor and presentation.
06 - Bake for 15 to 20 minutes, or until the fish flakes easily with a fork and is opaque throughout.
07 - Remove from the oven, garnish with additional chopped parsley if desired, and serve immediately.