Sprinkle fillets with 1 tsp. seasoning. Combine remaining seasoning, flour, and cornmeal. Dredge fillets in flour mixture, shaking off excess.
Melt butter with oil in a large skillet over medium-high heat; add fillets, and cook 3 to 4 minutes on each side or until fish flakes with a fork. Squeeze juice from lemon over fillets, and garnish, if desired. Serve immediately.