1. Preheat oven to 350 degrees F (175 degrees C). Spray a 9x13-inch baking dish with cooking spray. 2. Season both sides of zucchini slices with salt and pepper. 3. Spray a non-stick skillet with cooking spray and place over medium-high heat; cook and stir zucchini slices until lightly browned, 2 to 3 minutes per side. 4. Spread 1/2 cup marinara sauce in the prepared baking dish. Layer zucchini slices, overlapping slightly, on top of marinara layer. Spread 1/2 cup marinara sauce over zucchini layer; top with 1/4 cup Parmesan cheese and 1/4 to 1/2 cup mozzarella cheese. 5. Continue layering zucchini, 1/2 cup marinara, 1/4 cup Parmesan cheese, and remaining mozzarella cheese. 6. Bake in the preheated oven until cheese is melted, about 10 minutes. ---------------------------------------------------------------------------
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