Preheat your oven and bake the frozen garlic bread according to the package instructions. Keep the oven hot once it's finished.
Heat half the olive oil in a skillet over medium-high heat until shimmering. Add the shaved meat in a single flat layer. Pro Tip:
Let the meat sit undisturbed for 2 minutes to develop a dark, caramelized crust before flipping and breaking it apart.
Stir the Worcestershire sauce, garlic powder, onion powder, salt, and pepper directly into the hot, seared meat. Transfer the beef to a bowl, ensuring you leave the rendered fat and browned bits behind in the pan.
Add the remaining olive oil to the same skillet. Sauté the chopped onions and bell peppers over medium heat. They will pick up all the savory beef flavors (the fond) left in the pan. Sauté until tender.
To prevent the meat and vegetable juices from making the crisp garlic bread soggy, sprinkle half of your shredded provolone cheese directly onto the baked bread first. This creates a melted "fat barrier."
Pile the seasoned steak over the cheese barrier, then top with the sautéed peppers and onions.
Blanket the top with the remaining provolone cheese. Slide the baking sheet back into the oven for 5 minutes, or switch to "Broil" for the last 90 seconds to turn the cheese bubbly and golden-brown.