Preheat a gas grill to medium. In a small bowl, combine chili powder, garlic, cinnamon, cumin, onion powder, salt, and pepper. Stir to combine and set aside.

Arrange steak(s) on a work surface. Using a sharp knife, make several small shallow incisions along the steak surface, cutting against the grain. Rub chili mixture thoroughly into both sides of meat.

Oil grates and grill steak for 4 to 5 minutes per side for medium-rare. Remove steak to a cutting board and let stand for 5 to 10 minutes. Cut steaks into thin slices, working across the grain.