Preheat your oven to 375°F (190°C).
Slice the zucchini into thin strips using a vegetable peeler or mandoline.
Sprinkle zucchini strips with salt and let them sit for about 10 minutes to draw out moisture, then pat them dry with a towel.
In a large skillet, cook the ground beef over medium heat until browned. Drain any excess fat.
Stir in the marinara sauce, garlic powder, and Italian seasoning; simmer for another 5 minutes.
In a mixing bowl, combine the ricotta cheese, egg, and Parmesan cheese; mix well.
In a 9x13 inch baking dish, spread a layer of the meat sauce, then a layer of zucchini, followed by a layer of the ricotta mixture. Repeat the layers until ingredients are used, finishing with meat sauce on top.
Sprinkle the shredded mozzarella cheese on top and cover with foil.
Bake for 30 minutes covered, then uncover and bake for an additional 10 minutes or until cheese is bubbly and golden.
Allow to cool for 10 minutes before slicing and serving.