Preheat oven to 350°F.
Whisk together topping ingredients in a small bowl.
Cut the rolls in half separating the top and bottom.
Place the bottoms of the rolls in a 9×13 pan (I line with parchment paper for easy removal).
Spread dressing on rolls. Top with a layer of cheese, sauerkraut, corned beef and another layer of cheese.
Top with the other half of the rolls and gently spoon or brush the butter mixture overtop.
Bake about 20-25 minutes or until the cheese has melted and the tops are lightly browned. Serve warm.
