Preheat the oven to 425 degrees F. Spray a rimmed baking sheet and a 9-inch pie plate or quiche dish with cooking spray.
In a large bowl, combine the zucchini, mushrooms, onion, pepper, and vinegar; mix well. Arrange in a single layer on the prepared baking sheet.
Bake until the vegetables are soft and lightly browned around the edges, 13 to 15 minutes. Remove from the oven; cool in the pan on a wire rack for 5 minutes. Reduce the oven temperature to 350 degrees F.
In a medium saucepan, bring the water to a boil. Add the dried tomatoes and salt; simmer 5 minutes, stirring occasionally. Stir in the couscous. Remove from the heat; cover and let stand 5 minutes.
Stir in 1/4 cup of the wheat germ; mix well. Spoon the couscous mixture onto the bottom and up the sides of the pie plate. Sprinkle with 1/2 cup of the cheese; top with the roasted vegetables. Pour the egg whites over the vegetables.
In a small bowl, combine the remaining 1/4 cup wheat germ, 1/2 cup cheese, and the basil; sprinkle evenly over vegetables.
Bake until golden brown, 20 to 25 minutes. Cut into wedges to serve.