Heat olive oil in a skillet over medium heat. Add sliced onions and bell peppers. Sauté until softened and caramelized, about 5-7 minutes. Season with salt and black pepper.
4. **Assemble the Sandwiches:**
Layer the thinly sliced roast beef evenly onto the toasted rolls. Top with sautéed onions and peppers if using. Place the sliced provolone cheese on top of the roast beef.
5. **Melt the Cheese:**
Return the assembled sandwiches to the oven and bake for an additional 5 minutes, or until the cheese is melted and bubbly.
6. **Serve:**
Serve the sandwiches warm with a small bowl of warm beef broth on the side for dipping. Enjoy these savory, cheesy roast beef sandwiches with all the drippings and flavor!
Prep Time: 15 minutes | Total Time: 30 minutes | Servings: 4
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