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1. Preheat the oven broiler to high.
2. Open the sandwich rolls and spread each with 1 teaspoon of butter that has been softened.
3. Sprinkle each buttered sandwich roll with about 1/2 teaspoon of garlic powder.
4. Broil the sandwich rolls for 5 minutes, until the edges are slightly charred.
5. Set aside.
6. Heat a large heavy skillet over high heat and add the vegetable oil.
7. When the oil just begins to smoke, drop in the flat iron steaks and quickly sear them until the steaks are browned which takes about 3 minutes.
8. Flip the steaks over and sear the other side for another 3 minutes.
9. Remove the steaks immediately.
10. Set the steaks aside and keep warm.
11. Assemble each sandwich roll with spinach leaves, tomato and avocado slices on one side, and 2 slices of mozzarella cheese on the other side.
12. Sprinkle the tomato and avocado side with about 1/2 teaspoon of balsamic vinegar, and place a hot browned steak on the mozzarella cheese.
13. Fold each sandwich closed to serve.
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