Mexican Chicken Soup

INGREDIENTS

• 1 1/4 pounds skinless, boneless chicken breast halves
• 2 tablespoons taco seasoning mix
• 1 tablespoon vegetable oil
• 1/2 cup chopped onions
• 1/2 cup chopped celery
• 2 teaspoons ground cumin
• 1/4 teaspoon ground black pepper
• 1 cup water
• 3 (14 ounce) cans chicken broth
• 1 cup diced tomatoes
• 1 tablespoon chopped fresh cilantro
• 1 cup shredded Cheddar cheese
• 1 cup crushed tortilla chips
• 1 avocado - peeled, pitted and diced