01 - Preheat oven to 400°F. Lightly grease a baking dish large enough to accommodate tilapia fillets in a single layer.
02 - Pat tilapia fillets dry using paper towels. Season both sides with salt and pepper, then arrange in prepared baking dish.
03 - In small bowl, whisk together melted butter, lemon juice, lemon zest, and minced garlic until fully incorporated.
04 - Pour lemon butter mixture evenly over each tilapia fillet, ensuring complete coverage.
05 - Place one thin lemon slice on top of each fillet.
06 - Bake for 15-18 minutes until fish becomes opaque and flakes easily when tested with a fork.
07 - Remove from oven and garnish with chopped parsley before serving.