Texas Chicken Soup

Ingredients

• 1 1/2 lbs boneless skinless chicken breasts
• 1 medium yellow onion
• olive oil
• 1 (15 ounce) can chicken broth
• 1 (14 ounce) can chili beans, don't drain
• 1 (14 ounce) can kidney beans, don't drain
• 1 (14 ounce) can black beans, don't drain
• 1 (10 ounce) can of mild Rotel tomatoes & chilies or (10 ounce) can green chili peppers, don't drain
• 2 (15 ounce) cans corn, drain one
• 1 (1 1/2 ounce) package of mild taco seasoning
• 1 (1 ounce) package ranch dressing mix