Preheat oven to 350 degrees Fahrenheit. Lightly spray with cooking spray or butter a 9x13 inch baking dish.
Cut the rolls in half to separate the top and bottom bun.
In the pan, layer with the bottom buns, then evenly top with 1/2 the of the cheese, 1/2 of the turkey, sauerkraut, dressing, the other 1/2 of the meat, the other 1/2 of the cheese, and then the bun tops.
In a small bowl, mix together melted butter, onion powder, paprika, and poppy seeds. Brush over the tops of the buns.
Cover with aluminum foil and bake for 20-25 minutes or until the center is warm and the cheese is bubbly. Uncover and bake an additional 5 minutes until the tops are crispy. Remove and allow to cool for 5 minutes before serving.