In a large baking dish, combine the avocado oil and lemon juice.
Add the fish and turn to coat both sides.
Sprinkle with basil, salt, and pepper.
Layer the tomato slices evenly over the fillets and sprinkle with cheese.
Cover the dish with aluminum foil and bake for about 15 to 30 minutes or until the fish is easily pulled apart with a fork, or cook to an internal temperature of 145°F (63°C)