Heat the oil in a large dutch oven over medium high heat. Add the chicken and cook until browned, stirring frequently. Add the onion and cook for 3-5 minutes or until softened. Add the butternut squash, beans, chiles and chicken broth. Stir in the tortilla chips, bring to a boil, then reduce the heat and simmer uncovered for 10 minutes or until the squash is tender and chicken is cooked through.