Preheat your oven to 375°F (190°C).
Sprinkle the sliced zucchini with salt and let them sit for about 10 minutes to draw out excess moisture. Pat them dry with paper towels.
In a large skillet, heat the olive oil over medium heat. Add the zucchini slices in a single layer and sauté for about 3-4 minutes on each side until they are slightly golden. Remove from heat.
In a bowl, combine the ricotta cheese, half of the mozzarella cheese, Parmesan cheese, garlic powder, and Italian herbs. Mix until well combined.
In a baking dish, spread a thin layer of marinara sauce on the bottom. Layer half of the zucchini slices over the sauce.
Spread half of the ricotta mixture over the zucchini, then add another layer of marinara sauce. Repeat with the remaining zucchini and ricotta mixture. Top with the remaining marinara sauce and sprinkle the rest of the mozzarella cheese on top.
Cover the baking dish with aluminum foil and bake for 25 minutes. Remove the foil and bake for an additional 10-15 minutes, or until the cheese is bubbly and golden.
Let the dish cool for 5 minutes before serving. Garnish with fresh basil leaves if desired.