Prepare roast beef as indicated on package. When heated through, shredded beef with two forks and mix with remaining au jus in the container. Set aside.

Preheat non-stick skillet over medium heat.

Spread 1/2 Tablespoon on one side of each slice of bread.

Lay 4 slices of bread, butter down, in skillet. Top each slice of bread with one slice of cheese.

Divide shredded roast beef among the four sandwiches. Top with a second slice of cheese.

Place remaining bread slices on top, butter side up.

Allow to cook on first side 3-4 minutes, until toasted.

Carefully, flip sandwich over, and cook 3-4 more minutes on second side.

Cut and serve.