In a large pot, heat the olive oil over medium. Add the onion, bell pepper, jalapeno, and celery and sauté, stirring frequently until softened, about 12 minutes.
Add the chopped chicken and Cajun seasoning, and stir to brown the chicken, about 1 minute.
Add all of the remaining ingredients except for the rice and bring to a full boil.
Reduce heat, cover, and simmer for about 30 minutes or until all vegetables are softened and chicken is cooked through.
Serve over cooked brown rice.
Notes
*you may replace the chicken thighs with 2 boneless skinless chicken breasts