In a microwave safe bowl, add the vegetable oil, onion and celery. Cook until the onions are translucent about 8 minutes. Stirring occasionally about every 1-2 minutes of cook time.
In a Dutch oven combine the chicken, Rotel, tomato sauce, black beans, pinto beans, taco seasoning, water, and vegetables. Stir until incorporated.
Heat until bubbling and add the ranch powder. Stir until mixed thoroughly.
Reduce heat and simmer for 30 minutes. Salt and pepper to taste.
Garnish with sour cream, shredded cheese, corn chips, and cilantro.
Serve.