Preheat grill to medium high heat.
In a small bowl, combine chili powder, cumin, paprika, garlic, 1 teaspoon salt and ½ teaspoon pepper. Season steak with chili powder mixture.
Brush steak with 1 tablespoon canola oil. Add steak to grill, and cook, flipping once, until desired doneness, about 4-5 minutes per side for medium rare. Let rest 5 minutes.
Season bell peppers and onion with remaining 1 ½ tablespoons canola oil; season with salt and pepper, to taste.
Add bell peppers and onion to grill, and cook, turning occasionally, until charred and tender, about 6-8 minutes.
Thinly slice steak against the grain and serve with bell peppers and onion.
