Heat grill to medium. Cut a slit lengthwise in each chili and scoop out the seeds and ribs.
In a medium bowl, combine the beans, cheese, raisins, salsa, and chili powder. Stuff the peppers with the filling.
Season the steak with the oregano, ½ teaspoon salt, and ¼ teaspoon pepper. Grill to desired doneness, 3 to 4 minutes per side for medium-rare. Let rest 5 minutes before slicing.
Grill the peppers, turning frequently, until they are soft and the cheese has melted, 7 to 8 minutes. Serve with the sliced steak.