09/07/2026
🥩🧀 Cheesy Roast Beef & Caramelized Onion Sandwiches
These Cheesy Roast Beef & Caramelized Onion Sandwiches are loaded with tender roast beef, sweet golden onions, melted cheese, and a flavorful au jus for dipping. Perfect for an easy, hearty lunch or dinner!
🛒 Ingredients
1 lb thinly sliced deli roast beef
4 onion hamburger buns
1 cup beef broth
2 tbsp unsalted butter
1 large yellow onion, thinly sliced
4 slices provolone or Swiss cheese
1 tbsp Worcestershire sauce
1 tsp garlic powder
½ tsp black pepper
1 tbsp olive oil
Salt, to taste
👩🍳 Instructions
1. Caramelize the onions
Heat olive oil and butter in a skillet over medium heat. Add the sliced onions and cook for 8–10 minutes, stirring occasionally, until soft, golden, and caramelized.
2. Prepare the au jus
Add beef broth and Worcestershire sauce to the skillet. Season with garlic powder, black pepper, and a little salt. Bring to a gentle simmer.
3. Warm the roast beef
Add the sliced roast beef to the skillet and gently toss with the broth and onions. Cook for 2–3 minutes, just until warmed through. Don't overcook.
4. Toast the buns
Lightly butter the cut sides of the buns and toast them in a skillet or under the broiler until golden and crisp.
5. Assemble
Pile the warm roast beef and caramelized onions onto the toasted buns. Place a slice of provolone or Swiss cheese over each sandwich.
6. Melt the cheese
Place the sandwiches under the broiler for 1–2 minutes, until the cheese is hot, melted, and bubbly.
7. Serve & enjoy
Serve immediately with warm beef broth on the side for dipping. 🥩🧀🔥
⭐ Pro Tip
For an extra-creamy kick, spread horseradish mayo on the toasted buns before adding the roast beef.
