Preheat the oven to 375°F (190°C). Grease a 9×13-inch baking dish.

Combine the bread cubes with melted butter, garlic powder, onion powder, caraway seeds, salt, and pepper in a large bowl. Mix until well-coated.

Layer half of the seasoned bread cubes into the greased baking dish.

Add the chopped corned beef over the bread layer, spreading it evenly.

Spread half of the drained sauerkraut over the corned beef.

Pour ¾ cup of Thousand Island dressing over the sauerkraut, ensuring even coverage.

Sprinkle 1 cup of shredded Swiss cheese over the dressing.

Repeat layering with remaining bread cubes, corned beef, sauerkraut, dressing, and Swiss cheese.

Cover the dish with foil and bake for 20 minutes. Remove foil and bake for an additional 10-15 minutes until cheese is melted and top is lightly browned.

Cool for 5-10 minutes, cut into squares, and serve.