In a large nonstick skillet, heat oil over medium-high heat. Add poblano peppers and onion; cook and stir 4-6 minutes or until tender., Stir in tomatoes, olives, garlic, pepper and salt. Bring to a boil. Adjust heat to maintain a gentle simmer. Add fillets. Cook, covered, 8-10 minutes or until fish just begins to flake easily with a fork. Sprinkle with cilantro. Serve with lemon wedges and, if desired, bread.