Preheat your oven to 375°F (190°C). Slice zucchini lengthwise into 1/4-inch thick pieces.

Place zucchini slices on a baking sheet, drizzle with olive oil, and sprinkle salt and pepper. Coat evenly.

Grease an 8x8 inch baking dish with olive oil and layer half of the zucchini slices on the bottom, followed by half of the ricotta, marinara, and mozzarella.

Repeat layering with the remaining zucchini, ricotta, marinara, and mozzarella.

Sprinkle the top with dried oregano. Bake for 20-25 minutes until cheese is golden brown and zucchini is tender.

Let rest for 5 minutes, then garnish with fresh basil before serving.