Preheat oven to 350f degrees. Spray 11x7-inch or 9x13-inch baking dish (casserole will be thinner with a larger dish) with nonstick cooking spray.
Take four slices of rye bread and cut them into 2-inch cubes. Spread the cubed rye bread into the bottom of the prepared baking dish.
Place remaining 2 slices of rye bread into food processor and pulse into fine breadcrumbs and set aside.
Cover cubed rye bread evenly with half of the pastrami.
Then evenly top with 14.5 ounce can or jar sauerkraut, drained very well, 1 cup chopped dill pickles and 1 teaspoon caraway seeds.
Sprinkle 2 cups shredded Swiss cheese on top of sauerkraut layer.
Next, top with remaining pastrami. Push down on all the layers to help compact it a bit.
Sprinkle remaining 2 cups Swiss cheese and 1 teaspoon caraway seeds on top of pastrami.
In a medium bowl, whisk together 1 cup milk, 3 large eggs, beaten, ⅓ cup thousand island dressing and ¼ cup yellow mustard.
Pour mixture evenly over the casserole.
Top with the rye breadcrumbs you set aside earlier.
Cover with foil. Bake for 45 minutes.
Remove from oven, let rest for 5 minutes then slice and serve.
Video
Notes
Please refer to my FAQ’s (Frequently Asked Questions) and ingredient list above for other substitutions or for the answers to the most common questions.