Step 1

Melt the butter in a large skillet over medium high heat.  Add in the sliced onions and sauté for 10-15 minutes until the onions are soft and slightly browned.  Season with salt and pepper and remove from the heat.

Step 2

Preheat the oven to 350 degrees Fahrenheit and spray a 9X13 baking dish with a non-stick cooking spray.

Step 3

Slice the rolls in half lengthwise with a serrated knife to make sandwiches. Remove top and set aside.

Step 4

Place the bottom pieces into the prepared baking dish. Top with half of the sliced cheese.

Step 5

Layer the roast beef on top of the cheese and layer the onions on top.  Top with the remaining cheese slices.

Step 6

Place the tops of the rolls onto the sandwiches. Stir together the melted butter and dried onion soup mix.  Brush this mixture on top of the rolls.

Step 7

Cover with foil and bake for 25 minutes.  Remove the foil and cook for 5 more minutes to brown the top of the rolls slightly.

Step 8

While the rolls are baking, prepare the au jus gravy mix based on the package instructions with the water.

Step 9

Serve the rolls topped with fresh parsley and the au jus sauce for dipping.  Enjoy!