Top-ranked recipe named "Splatterdab's Chile Rub Flat Iron Steak"
Works best with a flat iron steak but use on any steak that you think would work well with a chile rub. The chipotle powder brings the flavor of smoked smoked jalapenos, the New Mexico brings a little more earthy heat. The chile powder brings that texas invented mixture of pepprers along with other ingredients depending on whose chile powder you use. You'll have to experiment to find which is best for you.
Mix all of the dry ingredients until thoroughly blended. sprinkle over steak and rub in. Suggest using rubber or kitchen grade laytex gloves. Cover or place in zip lock bag and place in refrigerator between 30 minutes to 2 days. Longer the better. Before putting meat on heat source drizzle with vegetable oil and rub in. Cook as desired.
For a little less heat substitute ancho or California chile powder for the New Mexico chile powder.