Preheat oven to 400 degrees F.
Spread sliced steak, bell peppers and onion on a large baking sheet.
Drizzle olive oil on top and toss to coat evenly.
In a small bowl, combine chili powder, cumin, garlic powder and paprika.
Sprinkle seasoning mix over meat and vegetables and toss to coat evenly.
Season with salt and pepper, to taste.
Cook for 15-20 minutes, or until meat has reached desired doneness and vegetables are soft.
Serve on tortillas and top with desired toppings.