In a Dutch oven over medium-high heat, ADD oil, onion and garlic; SAUTE until tender.
ADD zucchini, chicken broth (and stewed chicken meat if used), tomatoes, tomato sauce, corn, cumin and pepper.
Bring to a BOIL; COVER; REDUCE heat; SIMMER until flavors are blended, about 20 minutes.
SPOON soup into individual bowls; TOP with tortilla chips and shredded cheese.
For a heartier soup, add pieces of stewed chicken along with broth (one part chicken for four parts broth)
Per Serving (excluding unknown items): 486 Calories; 17g Fat (28.8% calories from fat); 19g Protein; 75g Carbohydrate; 12g Dietary Fiber; 24mg Cholesterol; 2921mg Sodium. Exchanges: 1 Grain(Starch); 1 1/2 Lean Meat; 9 1/2 Vegetable; 3 1/2 Fat.