Mix the brown sugar, garlic powder, onion powder, chili powder, ancho chile powder, chipotle chile powder, salt-free seasoning blend, salt, and pepper together in a bowl until thoroughly blended. Sprinkle over both sides of the steak, and rub into the meat. Cover, and refrigerate at least 30 minutes, or up to 2 days.
Before cooking, drizzle steak with vegetable oil, and rub the oil into the meat. Cook as desired.