Black Bean Tortilla Soup

• 1 tbspolive oil — optional
• 1medium onion — diced
• 2celery — sliced 1/4 inch thick
• ½ tspsalt
• 4garlic — minced
• 1 tspchili powder
• 1½ tspground cumin
• 1½ tspdried oregano
• 4–5 cupsvegetable broth
• 1 canblack beans — canned, drained, rinsed, 15 oz
• 15 ozdiced tomatoes (with juices) — 1 can
• 1 cupfresh corn kernels — or frozen corn kernels
• 1 candiced green chiles — 4½ oz, optional
• 2 tbspfresh lime juice

Optional Toppings

• 5 oztortilla chips — 1 bag
• 1 cupquinoa — or rice
• —cilantro
• —lime wedges