Combine first 7 ingredients in a large saucepan; bring to a boil. Reduce heat, and simmer, uncovered, 20 minutes.
Place eggplant in a large bowl; add water to cover, and let stand 30 minutes. Drain well; blot dry with paper towels. Combine 1/4 cup water and egg whites in a shallow bowl. Combine breadcrumbs and Parmesan cheese; stir well. Dip eggplant in egg white mixture, and dredge in breadcrumb mixture.
Place half of eggplant on a baking sheet coated with cooking spray, and broil 5 minutes on each side or until browned. Repeat procedure with remaining eggplant. Set eggplant aside.
Spread half of tomato mixture in bottom of a 13 x 9-inch baking dish coated with cooking spray. Arrange half of eggplant over sauce; top with half of mozzarella cheese. Repeat layers with remaining sauce, eggplant, and cheese.
Bake at 350° for 30 minutes or until bubbly. Let stand 5 minutes before serving. Garnish with fresh oregano sprigs, if desired.