Heat oven to 400. Spray a 9" x 13" casserole dish w/ cooking spray.
Cook pasta as directed, drain, keep warm. In lg skillet, heat 1/4" oil over medium heat until hot. Fry eggplant in oil, a few slices at a time until browned on both sides. Drain on paper towels. Reserve 1 cup marinara sauce.
Combine remaining sauce and pasta. Layer 1/2 the ziti mix in bottom of dish. Sprinkle w/ 3/4 cup mozzarella cheese, 1/2 the egplant and 2 tbsp parmesan cheese. Repeat layers. Top w/ reserved sauce, remaining mozzarella cheese and parmesan cheese. Bake 30 min, or until bubbly and heated through.