Cook pasta according to package directions. Meanwhile, in a large nonstick skillet coated with cooking spray, cook eggplant in oil over medium heat for 3 minutes. Add mushrooms and garlic; cook 3-4 minutes longer or until vegetables are tender., Stir in the tomatoes, water, tomato paste, oregano, salt and pepper. Bring to a boil. Reduce heat; simmer, uncovered, for 5 minutes. Stir in olives; heat through., Drain pasta; toss with eggplant mixture. Sprinkle with feta cheese and parsley.