Preheat the Oven: Preheat the oven to 425°F and allow the tilapia to come to room temperature.
Prepare the Baking Dish: Lightly oil the baking dish so the tilapia can be placed directly inside for baking.
Dry the Tilapia: Pat each tilapia fillet dry, then arrange the fillets in the prepared baking dish.
Season the Fish: Drizzle the tilapia lightly with olive oil, then evenly divide the kosher salt, lemon pepper, garlic powder, and fresh lemon zest among the fillets.
Bake the Tilapia: Place the baking dish in the 425°F oven and bake the fillets for 16 to 18 minutes, depending on their thickness, until they are browned and flaky and reach an internal temperature of 140°F when checked with a food thermometer.
Finish with Lemon: Remove the baked tilapia from the oven, spritz the fillets with the juice from 1/2 of the lemon, and finish with slices from the remaining lemon half.
Garnish and Serve: Sprinkle the fish with fresh Italian parsley or other fresh herbs, then serve immediately with an optional dipping or butter sauce if desired.
Store Leftovers: Refrigerate any leftover tilapia for up to 3 days.