Preheat oven to 400 degrees F. Grease a 9 x 13 inch baking dish with butter. Set aside.
Place the bread cubes in a large bowl. Add the melted butter and toss to coat.
Place one half of the bread cubes evenly in the bottom of the baking dish.
Evenly distribute the corned beef on top of the bread cubes.
Evenly distribute the sauerkraut on top of the corned beef.
In a small bowl, make the 1000 island dressing. Add the mayonnaise, ketchup, and sweet pickle relish and stir to combine. Spread the dressing evenly over the sauerkraut.
Sprinkle one half of the Swiss cheese evenly over the dressing.
Evenly distribute the remaining bread cubes over the Swiss cheese.
Sprinkle the remainder of the Swiss cheese over the bread cubes.
Bake in the oven for 20 to 25 minutes or until the casserole to hot and the cheese is melted.
Remove the casserole from the oven and sprinkle with parsley. Cut into squares and serve.
Video
Notes
Making and shredding a whole corned beef makes for the best reuben casserole. But thinly sliced deli corned beef can stand in as a suitable substitute.
Homemade dressings are much more flavorful and take only a few ingredients to make. Whipping up a delicious 1000 island dressing takes less than a minute with pantry ingredients. A store bought dressing of this creamy dressing is an acceptable alternative.
Make sure to shred the Swiss cheese either by hand or with a food processor. It will be much fresher tasting than the pre-shredded variety.
Any leftovers reheat beautifully in the microwave. Use 60% power for 1 to 2 minutes until the reuben casserole is hot and the cheese is melty.