Cut steak horizontally from a long side to within 1/2 in. of opposite side. Open meat so it lies flat; cover with plastic wrap. Flatten to 1/4-in. thickness. Remove plastic and set aside.
In a large resealable plastic bag, combine the oil, vinegar, Italian seasoning, Worcestershire sauce, garlic powder, 1 teaspoon pepper and seasoned salt; add steak. Seal bag and turn to coat; refrigerate overnight.
Drain and discard marinade. Combine the bacon, garlic, parsley, onion, salt and remaining pepper; sprinkle over steak to within 1 in. of edges. With the grain of the meat going from left to right, roll up jelly-roll style; tie with kitchen string at 1-in. intervals. Cut into six 1-1/4-in. rolls.
If grilling the steak rolls, coat grill rack with cooking spray before starting the grill. Grill steak rolls, covered, over medium heat or broil 4-6 in. from the heat for 5-7 minutes on each side or until meat reaches desired doneness (for medium-rare, a meat thermometer should read 145°; medium, 160°; well-done, 170°). Cut and remove string before serving. Yield: 6 servings.
