Preheat oven to 375°F (190°C).

Lightly brush zucchini slices with olive oil, season with salt and pepper, and grill or roast them for 4–5 minutes per side until tender.

In a medium bowl, mix ricotta cheese with egg, Parmesan, Italian herbs, and garlic until smooth.

Spread ½ cup of marinara sauce in the bottom of a baking dish.

Add a layer of roasted zucchini slices, followed by a layer of the ricotta mixture and a handful of shredded mozzarella.

Repeat layers until ingredients are used, finishing with marinara sauce and mozzarella on top.

Cover with foil and bake for 20 minutes, then uncover and bake an additional 10 minutes until the cheese is bubbly and golden.

Let rest for 5–10 minutes before serving. Garnish with fresh basil if desired.