how long to cook tilapia in the oven
1 Place fillets in baking dish. 2  Pour lemon juice over fillets, then drizzle butter on top. 3  Sprinkle with garlic, parsley, and pepper. 4  Bake in preheated oven until the fish is white and flakes when pulled apart with a fork, about 30 minutes. Pour lemon juice over fillets, then drizzle butter on top. 2  Sprinkle with garlic, parsley, and pepper. 3  Bake in preheated oven until the fish is white and flakes when pulled apart with a fork, about 30 minutes.