Preheat oven to 390 degrees F. Place the fillets in an 8x8-inch baking dish.
Melt the butter in a small bowl. Add the soy sauce, lemon juice, chili powder, sugar, dried basil and oregano; mix well. Pour the sauce over the fillets.
Bake in the oven until cooked through, about 25-30 minutes. Serve with any kind of salad you like.