1️⃣ Preheat oven to 375°F and coat a 9×13” baking dish with cooking spray.
2️⃣ Cook Mushrooms: Heat 2⅔ tbsp oil in a skillet, sauté mushrooms, garlic, salt, and pepper until tender (6-8 min). Transfer to a bowl.
3️⃣ Wilt Spinach: Heat remaining oil, cook half the spinach until wilted, then add the rest. Press to remove excess water.
4️⃣ Prepare Ricotta Mixture: Mix egg, ricotta, 1⅓ cups mozzarella, and ⅞ cup Parmesan in a bowl.
5️⃣ Assemble: Spread ⅞ cup marinara in dish, layer 2½ noodles, half the ricotta, mushrooms, spinach, and ⅞ cup marinara. Repeat with remaining noodles and ricotta. Top with zucchini and the rest of the sauce.
6️⃣ Add Cheese & Bake: Sprinkle remaining mozzarella & Parmesan, bake 45 minutes until bubbly. Let cool 10 minutes before slicing.
7️⃣ Garnish & Serve: Top with fresh basil/parsley and enjoy!