Preheat oven to 350°F Grease a shallow baking dish.
Scoop out the flesh of the zucchini; chop the flesh and set aside. Place the shells in the prepared baking dish.
Rinse and drain the can of chick peas. Take half the chick peas and use a hand held blender to puree them.
Heat oil in a large skillet over medium heat. Saute onions for 5 minutes, then add garlic and saute 2 minutes more. Stir in chopped zucchini and mushrooms; saute 5 minutes. Stir in coriander, cumin, chick peas (whole and pureed), lemon juice, salt and pepper. Spoon mixture into zucchini shells.
Bake in preheated oven for 30 to 40 minutes, or until zucchini are tender. If desired, top with shredded cheese during the last 5 minutes of baking.