Stuffed Zucchini

My friend Cori made this for Bunco and I loved it!  Plus a good way to use the extra zucchini this time of year :)
                  Stuffed Zucchini
1lb. ground beef or can use 1/2 sausage and 1/2 beef, cooked
1c. stuffing mix (stove top) or bread crumbs
1 small onion, chopped
32 oz. spaghetti sauce
1 chopped clove garlic
1/2 c. grated Parmesan cheese, fresh
1/2c. mozzarella cheese

**Mix all together, leaving some cheese for later, stuff in a hollowed out zucchini that is sliced sideways (hollow until about 1/2", save some of the soft flesh and chop and put in mixture),  tightly cover with foil and bake at 350 F.  for about 1 hour, take foil off add the rest of the cheese on top and put under broiler for 5 min or until cheese is bubbly.  
**Use a medium zucchini.  
**also I would sautee the onion and garlic with the flesh of the zucchini, then add the meat, stuffing, and sauce.