Gather the essential ingredients for your Reuben Casserole
Begin by layering rye bread slices at the bottom of a baking dish.
Add a layer of sliced corned beef on top of the bread slices.
Spread a layer of sauerkraut evenly over the corned beef.
Drizzle Thousand Island dressing over the sauerkraut layer.
Place slices of Swiss cheese over the dressing layer.
Repeat the layers once more: rye bread, corned beef, sauerkraut, dressing, and Swiss cheese.