Ready to make this delightful dish? Follow these steps, and you’ll have a delicious meal on the table in no time.

1. Heat olive oil in a skillet over medium heat. Add the onions and sauté until caramelized, about 10 minutes.
2. In a small saucepan, combine beef broth, Worcestershire sauce, garlic powder, salt, and pepper. Bring to a simmer and let it reduce slightly, about 5 minutes.
3. Spread butter evenly on one side of each slice of sourdough bread.
4. Place 4 slices of bread, butter side down, on a preheated griddle or skillet.
5. Layer each slice with a piece of provolone cheese, a generous portion of roast beef, caramelized onions, and another slice of cheese.
6. Top with remaining bread slices, butter side up, and cook until the bread is golden brown and the cheese has melted, about 3-4 minutes per side.
7. Remove from heat, slice diagonally, and serve with warm au jus for dipping.

It’s important to keep an eye on the bread to ensure it doesn’t burn. If you’re like me and prone to distractions, setting a kitchen timer can be a lifesaver. Trust me, there’s nothing worse than the smell of burnt bread when you’re eagerly awaiting a delicious meal.