1Heat oven to 350ºF. Spray rectangular baking dish, 11x7x1 1/2 inches, with cooking spray. Mix shredded cheese, zucchini and cilantro.
2Spread each tortilla with about 2 teaspoons cream cheese. Spoon about 1/3 cup shredded cheese mixture onto each tortilla; spread to within 1 inch of edge. Roll up tortillas; place seam sides down in baking dish. Pour salsa over tortillas.
3Cover and bake about 25 minutes or until hot. Top with avocado and onions.