Heat 1 teaspoon olive oil in skillet. Add mushrooms; cook 4 minutes to release liquid. Add tomatoes and garlic; cook 5 minutes or until tomatoes start to soften. Add snap peas, cover; cook 5 minutes or until snap peas turn bright green and are tender. Stir in green onions. Remove vegetables from skillet; keep warm. Coat fish filets evenly on both sides with Italian seasoning. Heat remaining olive oil in skillet. Add fish; cook 3 minutes per side; in two batches if necessary. Serve with warm vegetables.