01 - 
                Lightly coat a 9x13 inch baking dish with cooking spray to prevent sticking and ensure easy serving.
              
              
              
                02 - 
                Place the 2-inch rye bread cubes evenly in the bottom of the dish, pressing lightly to form a uniform layer.
              
              
              
                03 - 
                Set aside the processed fine rye breadcrumbs for topping later.
              
              
              
                04 - 
                Distribute half of the sliced pastrami or corned beef over the bread cubes, covering edges for even layering. Scatter diced dill pickles evenly over the meat.
              
              
              
                05 - 
                Evenly spread the well-drained sauerkraut atop the meat and pickles. Sprinkle 1 teaspoon of caraway seeds over the layer.
              
              
              
                06 - 
                Sprinkle 1 cup of shredded Swiss cheese over the sauerkraut mixture.
              
              
              
                07 - 
                Place the remaining sliced pastrami evenly on top of the cheese and gently press down to compact the layers.
              
              
              
                08 - 
                Top the meat layer with the remaining shredded Swiss cheese and sprinkle the remaining 1 teaspoon caraway seeds for flavor and crust formation.
              
              
              
                09 - 
                In a medium bowl, thoroughly whisk whole milk, eggs, Thousand Island dressing, and yellow mustard until smooth and combined.
              
              
              
                10 - 
                Carefully pour the custard mixture evenly over the layered ingredients, allowing it to seep between layers. Finish by sprinkling reserved rye breadcrumbs on top.
              
              
              
                11 - 
                Cover the dish tightly with aluminum foil and bake at 350°F (175°C) for 45 minutes until the casserole is puffed and the cheese is bubbling.
              
              
              
                12 - 
                Remove from oven, let rest uncovered for at least 5 minutes to allow setting before slicing. Serve warm for best texture and flavor.