Heat oven to 350° F. Spray 10-inch nonstick skillet with nonstick cooking spray. Cook onion, garlic and chiles in skillet over medium heat, stirring frequently, until onion is tender; reduce heat.
Stir in remaining ingredients except fish steaks. Simmer uncovered over low heat 5 minutes, stirring occasionally. Arrange fish in ungreased rectangular baking dish, 11x7x1-1/2 inches. Spoon tomato mixture over fish.
Bake uncovered 25 to 30 minutes or until fish flakes easily with fork. Sprinkle with chopped fresh cilantro if desired.Servings: 4