Step 1: Preheat your oven to 350°F. Grease a small baking sheet with cooking spray. Unroll one tube of crescent rolls onto the pan and pinch the seams together. Bake until lightly golden, about 10 minutes.
Step 2: Layer the corned beef, Swiss cheese, and sauerkraut on top of the partially baked crescent rolls. Top with the second tube of crescent rolls and pinch the seams and sides together. Brush with melted butter and sprinkle with salt and caraway seeds.
Step 3: Bake until golden and the dough is cooked through, about 30 minutes more.
Step 4: While the squares are baking, make the Russian dressing. In a medium bowl, combine the mayonnaise, ketchup, horseradish, Worcestershire sauce, sugar, and paprika. Season with salt and pepper.
Step 5: Cut the Reuben squares into pieces and serve with the Russian dressing for dipping. Enjoy!