First you need to get some of the excess moisture out of the cabbage since we'll be adding some with the dressing. Heat a 10 inch nonstick skillet over medium heat. When hot add corned beef and cabbage. Cook until most of the moisture has evaporated stirring often, just a few minutes.

Transfer mixture to a medium bowl and let cool about 10 minutes. Stir in shredded swiss and dressing until combined. Rinse and dry skillet and heat over medium-low. While heating spread 1/2 tbs butter on one side of each slice of bread.

I find it works best to cook one sammich at a time, so place one slice of bread butter side down in skillet. Spoon about half the filling over bread slice in skillet. Top with second slice of bread, butter side up.

When bottom slice is browned (about 4-5 min) flip, gently press down on top with spatula, cover skillet to ensure everything gets melty while the second side browns (another few minutes).

Transfer to a plate, let rest a few minutes. Cut to serve if desired. Enjoy!