Slice the zucchini into thin ribbons using a mandoline or sharp knife. Lay them on a tray, sprinkle with salt, and let them sit for a few minutes. This draws out excess water for a richer lasagna.
In a skillet, heat olive oil and cook the sausage until browned. Stir in marinara, fresh oregano, and thyme, then simmer for 10–15 minutes. Adjust seasoning with salt, pepper, or a pinch of red pepper flakes for heat.
In a mixing bowl, combine ricotta, provolone, and an egg. Mix until smooth and creamy, then season lightly with salt and pepper. This will be your luscious middle layer.
Spread a thin layer of sauce in the baking dish. Add a layer of zucchini ribbons, then a layer of the ricotta mixture. Repeat until all ingredients are used, finishing with sauce and mozzarella on top.
Mix breadcrumbs with dried oregano and a drizzle of olive oil. Sprinkle evenly over the lasagna for a crunchy, flavorful topping.
Bake in a preheated oven at 375°F (190°C) for 35–40 minutes, until the cheese is melted and sauce is bubbling. Let it rest for 5–10 minutes before slicing.