Trim any excess fat from the strip steaks and cut them into bite-sized pieces.
In a bowl, mix soy sauce, Worcestershire sauce, balsamic vinaigrette, garlic paste, and Blackstone Steakhouse seasoning. Add the steak pieces and marinate for 2-4 hours in the refrigerator.
Heat the Blackstone griddle to high.
Thread the marinated steak pieces and mushrooms onto the bamboo skewers, alternating between them.
Drizzle cooking oil on the hot griddle. Place the skewers on the griddle and cook, turning occasionally to ensure a nice sear on all sides of the steak.
Once the steak is cooked to your desired doneness, remove the skewers from the heat. Sprinkle with chopped chives and an additional dash of Steakhouse seasoning.