Heat the oil in a Dutch oven over MEDIUM heat. Add the onion, bell pepper, and jalapeno pepper and cook, stirring occasionally, for 4 to 5 minutes, or until softened. Add the garlic and cook, stirring, until fragrant, about 1 minute. Sprinkle the flour over the mixture and cook, stirring for another minute or two. Slowly pour in the chicken broth, stirring as you add it until smooth and just slightly thickened. Add the diced tomatoes (with juice), beans, chicken, and all the seasonings. Increase the heat and bring the mixture to a boil. Reduce the heat, cover the pot, and simmer for 15 minutes.