Preheat the oven to 400 degrees F. Lightly grease a 9x13 baking dish.
With a teaspoon, scoop out the flesh from the interior of the zucchini, so they resemble boats. Sprinkle a little salt and pepper on each shell and place into the baking dish.
With the zucchini flesh that was removed, roughly chop and set aside.
In a medium pan over medium heat, add oil. Add in onions cook until translucent about 3-4 minutes.Add in garlic and cook for 1 more minute, careful not to burn.
Add in meatless crumbles and cook for 4 minutes. Add zucchini flesh and Italian seasoning. Cook until softened, about 3-4 minutes.
Pour the marinara sauce into the pan and bring to a simmer; cook for 5 minutes or until most of the liquid has dissolved.
In a medium bowl, combine the vegan parmesan and breadcrumbs.
Spoon in and mound the meatless mixture into the zucchini boats. Sprinkle the breadcrumb mixture over top.
Place in oven and bake until golden on top, 20-25 minutes.