Prepare the baking sheet by lining it with parchment paper. Place the basa fish fillets on the prepared sheet.
Make the marinade: In a small bowl, melt the butter and mix in the sweet paprika, dried basil, salt, and lemon juice.
Marinate the fish: Using a silicone brush or spoon, spread the marinade evenly on both sides of the fish fillets. Let the fish marinate for 20 minutes.
Add lemon slices: Place lemon slices on top of the marinated fish for extra flavor.
Preheat the oven to 350 F (175 C).
Bake the fish: Place the baking sheet in the oven and bake uncovered for 30 minutes, or until the fillets are tender, flaky, and cooked through.
Serve immediately and enjoy your healthy, oven baked basa fish fillets.
