Preheat the oven to 350 degrees.
Into a large mixing bowl, add the panko bread crumbs and milk. Mix until paste forms.
To the paste, add in the ground turkey, eggs, seasonings, Worcestershire sauce, feta cheese, zucchini, and 1/2 cup of marinara.
Using your hands, mix all of the ingredients until evenly distributed.
Spray a large baking sheet with cooking spray. Place the meatloaf mixture onto the baking sheet and form it into a loaf
Spread the remainder of the marinara sauce on top of the zucchini meatloaf.
Cook for 1 hour 15 minutes or until the internal temperature reaches 160 degrees.
Let sit for 5 minutes, cut into eight slices, and serve or store in the refrigerator or freezer.