Preheat oven to 350 degrees.
In a blender or food processor, blend dried mushrooms until they are a fine powder (this will act as a binder instead of using breadcrumbs.)
Add mushroom powder into large bowl, set aside.
Whiz large zucchini, carrots, and onion in food processor until finely diced and add to mushrooms in large bowl.
Add ground beef, parmesan cheese, Worcestershire sauce, celery, Italian sausage, eggs, garlic, herbs, and seasonings and mix well.
Grease a loaf pan well.
Pour about 1/4 cup marinara sauce into bottom of greased loaf pan.
Add meat mixture into loaf pan and top with 1/2 cup marinara sauce (do not use all your sauce, this will break down in the oven and you'll want more to top it with when meatloaf is done.)
Cover meatloaf and loaf pan with foil and bake at 350 until meatloaf is 150 degrees internal temperature, making sure to poke your thermometer in a couple of places to be sure all of the meatloaf is cooked through.
Remove from oven and top with sauce, parmesan cheese, and parsley to garnish.