Add garlic and onions; saut 30 seconds, stirring constantly.
Add chicken broth and 2 cups water; bring to a boil.
Add orzo, lemon rind, and chickpeas. Cover and cook 10 minutes or until orzo is done. Stir in oregano and next 4 ingredients (through spinach). Ladle 1 3/4 cups soup into each of 4 bowls; top each serving with about 4 teaspoons cheese.