In a large stock pot heat the vegetable oil. Add the onions and cook for 2 minutes. Once the onions have softened add the garlic and jalepenos and cook for another minute.
Pour the chicken broth, tomatoes and beans into the pot and bring to a boil.
Once at a boil lower heat to simmer and add your chicken breasts. Cook the chicken for 20 to 25 minutes. Once chicken is cooked remove from pot. When cool enough to handle shred it and set it aside.