Cut the steak into thin strips. This helps it cook evenly.
Season with chili powder, salt, and pepper.
Slice the bell peppers and onion.
Heat 1 tbsp of oil in a skillet.
Sauté the vegetables until soft, about 5 minutes. Remove from skillet.
Add remaining oil to the skillet.
Place steak strips in the skillet. Cook for 2-3 minutes per side.
Ensure the steak is browned through.
Warm the tortillas on a griddle or microwave.
Place steak and vegetables on the tortilla.
Fold tortillas over the filling.