Cut each squash and zucchini lengthwise into 4 slices; set aside.
Combine eggs and water, stirring well. Combine breadcrumbs and next 5 ingredients; stir well. Brush squash and zucchini slices with egg mixture. Dredge in breadcrumb mixture, covering vegetables completely; reserve remaining breadcrumb mixture.
Heat oil in a large nonstick skillet over medium-high heat. Add squash and zucchini to skillet; cook2 to 3 minutes on each side or until lightly browned. Alternately layer squash and zucchini in a 13- x 9-x 2-inch baking dish coated with cooking spray.
Pour tomato over squash and zucchini. Top with remaining breadcrumb mixture. Cover and bake at 350° for 35 minutes. Uncover and sprinkle with Romano cheese. Bake 25 minutes. Let stand 10minutes before serving.