Preheat the Oven: Preheat your oven to 400°F (200°C).
Prepare the Zucchini: In a bowl, toss the sliced zucchini with olive oil, minced garlic, oregano, salt, and pepper. Spread them out on a baking sheet.
Prepare the Tilapia: In a shallow dish, combine the grated Parmesan cheese and breadcrumbs. Dip each tilapia fillet into the mixture, pressing gently to adhere the coating.
Bake: Place the coated tilapia fillets on the same baking sheet as the zucchini. Bake for 15-20 minutes, or until the tilapia is cooked through and the crust is golden brown.
Serve: Garnish the tilapia with fresh parsley if desired, and serve alongside the roasted zucchini.