Preheat the Oven:

Set your oven to 375°F (190°C).
Grease a 9×13-inch baking dish.
Layer the Bottom Crust:

Unroll one can of crescent roll dough and press it into the bottom of the baking dish.
Pinch seams together to form a solid crust.
Build the Layers:

Spread ½ of the Swiss cheese over the dough.
Evenly layer the corned beef over the cheese.
Spread the sauerkraut over the beef.
Drizzle with Thousand Island dressing.
Top with the remaining Swiss cheese.
Add the Top Crust:

Unroll the second can of crescent roll dough and lay it over the filling.
Pinch edges together to seal.
Brush & Bake:

Brush the top with beaten egg and melted butter.
Sprinkle with caraway seeds (if using).
Bake for 20-25 minutes, or until golden brown.
Cool & Serve:

Let it rest for 5-10 minutes before slicing.
Serve warm with extra Thousand Island dressing for dipping!