Heat EVOO in a large soup pot over medium-high heat. Add celery, carrots, onions, chili powder and bay leaf, and season with salt and pepper. Cook for about 2-3 minutes and add chicken stock. Bring to a boil, add the orzo pasta and cook according to the package instructions adding the chicken pieces during the last 4-5 minutes of cooking along with the tomatoes, corn and beans to heat through.
Ladle a portion of soup in a bowl and garnish with sliced scallions and tortilla chips. Serve with lime wedges to add a zip.