Preheat the oven to 375 F. On a lightly floured surface unroll one package of crescent rolls dough and line it onto the bottom of a greased baking dish. Bake for 10 minutes or until golden.
Arrange half of the cheese slices on top and layer with corned beef.
In a medium bowl combine sauerkraut with Thousand Island salad dressing. Spread this mixture over the beef layer and top with the remaining cheese slices.
Roll the second tube of the dough on a lightly floured surface. Try to roll and shape it into the size of your baking dish, and seal all seams. Place on top of the cheese layer. Brush with lightly beaten egg white and sprinkle with caraway seeds.
Bake for 12-15 minutes or until golden and crispy on top. Let sit for 5 minutes before cutting. Divide between serving plates and enjoy!