Philly Philly Cheese Steak Bread

Remove the sirloin steak from the fridge 20 minutes before you are ready to cook it; lightly season with salt and pepper on each side and let rest. Slice the seasoned steak into thin slices, across the grain.
Preheat oven to 400 degrees F. Heat oil over medium high heat in a large heavy-bottomed skillet.
Add the seasoned steak slices to the hot oil in the preheated skillet and cook for 2 minutes; flip steak and cook an additional minute. Stir in 1 Tbs. Worcestershire sauce, then remove steak from the skillet and reserve.
Add butter, bell peppers, onions, and mushrooms to the pan drippings in the skillet, cooking vegetables for 2-3 minutes or until slightly softened, as desired, stirring often.
In a small bowl, combine mayonnaise with 1 tsp. Worcestershire sauce; spread prepared mayo over both halves of the bread. Place bread halves onto a rimmed baking sheet, side by side.
Layer bread with the cheese slices place over the mayo, then top with the prepared steak, vegetables and mozzarella cheese.
Bake, uncovered, on the center rack of the oven for 15-20 minutes or until cheese is nicely melted, golden brown and a bit bubbly.
Remove cheese steak bread from the baking sheet to a large cutting board. Use your pizza cutter to slice the bread into serving pieces. Dig in!