In a small bowl, mix together chili powder, onion powder, garlic powder, oregano, smoked paprika, cumin, black pepper and salt Store in an airtight container
In a mixing bowl, combine steak and taco seasoning (You can leave steak to marinate for several hours or overnight).
Heat 1 teaspoon of oil in a skillet or frying and stir fry beef , in batches until browned. About 2 minutes. Transfer steak to a plate and cover with a foil.
Heat remaining oil in skillet, stir fry onion and bell peppers until just tender. Return steak to wok and toss together.
Serve with rice and a side salad.