Preheat the oven to 400 degrees Fahrenheit.
Lightly spray a baking dish with cooking spray.
Rinse the walleye filets under cold water and pat them dry with paper towels.
Combine the dried basil, minced onion, dried parsley flakes, salt, and garlic powder into the bowl. Stir the mixture well to ensure all the ingredients are evenly distributed.
Place the walleye filets in the prepared baking dish, arranging them.
Evenly sprinkle the seasoning mix over the filets, ensuring each piece is well-coated.
Drizzle or spoon the melted butter over the seasoned filets.
Transfer the baking dish to the preheated oven. Bake the filets for 8 to 11 minutes.
Once baked, remove the filets from the oven and let them rest for a minute.
Serve and Enjoy!