Fajitas are a fuss-free weeknight meal -- just set out the filling, tortillas and toppings so everyone can assemble their own fajita as desired.
Toss steak slices with Seasoning and oregano in medium bowl. Set aside. Heat oil in large skillet on medium-high heat. Add bell pepper and onion; cook and stir 5 minutes. Remove vegetable mixture from skillet.
Stir beef mixture into skillet; cook and stir 5 minutes or until beef is no longer pink. Return vegetable mixture to skillet; cook and stir 1 to 2 minutes or until heated through.
Spoon onto warmed tortillas. Serve with assorted toppings, if desired.
Serving Suggestion: Serve with assorted toppings such as salsa, shredded cheese and sour cream.