Weight Watchers No-Noodle Vegetable Lasagna

sprays cooking spray divided

medium eggplant, trimmed, and sliced

large uncooked zucchini, trimmed, and sliced

large egg, beaten

part-skim ricotta cheese

basil, fresh, cut into thin strips

grated Parmesan cheese, divided

store-bought marinara sauce, divided

Lbs shredded part-skim mozzarella cheese, divided