Skin and cut fish into 4 - 6 ounce servings. Combine in small bowl onion powder, garlic powder, peppers, salt and thyme. Heat iron skillet or heavy aluminum skillet over high heat. Brush fillets with some of the melted butter. Coat fillets with seasonings. Coat heavy for very hot. Coat lightly for medium hot. Add fillets to un-oiled skillet, drizzle with a little margarine or butter. Cook, uncovered over high heat about 2-3 minutes per side or until fish flakes when probed with fork.