Combine oil, chili powder, garlic powder, cumin and salt in a large bowl. Rub steak with half of the spice mixture. Add onions, bell peppers and poblanos to the bowl and toss to coat. Carefully place the steak on the pan on the top rack. Carefully spread the vegetables on the pan on the lower rack. Roast until the steak and vegetables are starting to brown, about 8 minutes.