If you are making the toast, make them first by preheating the oven to 350°F. Place the slices of bread on a sheet tray in a single layer. Bake for 5 minutes, flip and bake an additional 5 minutes. Cut into triangles and set aside until serving.
Preheat the oven to 400°F. Spray a 9-inch baking dish with cooking spray and set aside.
Whip the cream cheese in a large bowl with an electric hand mixer until smooth.
Add the mayonnaise, Thousand Island dressing, and sour cream, mix until smooth.
Fold in half of the shredded Swiss cheese, corned beef, and sauerkraut.
Add the mixture to the prepared baking dish and smooth it out. Add the remaining cheese on top.
Bake for 15-20 minutes until bubbly and the cheese is melted. Turn on the broiler and brown the cheese if desired.
Serve immediately with a garnish of parsley if using and the toast, or whatever dippers you like.
Notes
You really want to make sure the sauerkraut is drained well or the moisture from it can make the dip kind of runny. So just rinse it under cold water then place it in a clean kitchen towel and ring it out as best you can. I like to chop it up because it can be stringy and hard to get it out of the dip, but you can skip that part if you like it stringy.
If you don't like Swiss cheese, you can use mozzarella, provolone, or Gruyere
I used deli corned beef, but if you have leftover corned beef, you can use that. Just chop it up well.
In place of Thousand Island dressing, you can use Russian or French dressing.
Other dippers, wheat thins, celery, carrots, chips, etc. If you can find the little cocktail pieces of Pumpernickel bread from Pepperidge Farm (which I used to be able to find but can’t anymore) then those can be toasted and used as well. Everything would be good with this! I do suggest if using chips, get the lightly salted kind or the salt mixed with the dip might be too much.
Keep leftovers in the fridge for up to 3 days. Reheat in the oven covered with foil or in the microwave.
I do not suggest freezing, some of the ingredients do not freeze well and it may end up separating while frozen.