Preheat oven to 375 degrees. Spray a 9 x 13 baking dish with non-stick cooking spray.
Unroll one tube of crescent roll dough and lay it across the bottom of the prepared baking dish (push up the sides just about 1/4 inch.
Place in preheated oven for 8-10 minutes until just lightly golden brown. Remove from oven.
Place 6-8 slices of swiss cheese evenly over the baked crescent dough.
Layer 6-8 slices of pastrami on top of the swiss cheese to cover.
Spread drained sauerkraut over the pastrami evenly.
Layer the rest of the cheese (6 slices) over the sauerkraut evenly.
Drizzle thousand island dressing over the cheese.
Unroll the other tube of crescent roll dough and lay it over the dressing to cover. Seal the perforated edges of the dough.
Brush beaten egg white all over the top crescent roll dough.
Place back in the 375 degree preheated oven for 16 minutes or so until the top crescent roll dough is golden brown and cooked through.
Cut into squares and enjoy.