Add the oil to the pan and swirl until it coats the entire bottom of the skillet. Bring to a high heat and toast one side of each slice of bread

Remove the bread from the pan, reduce heat to low and cook the corned beef and sauerkraut for 2-3 minutes

https://cookpad.wasmer.app/us/recipes/416527-texs-small-batch-sauerkraut

Pile the corned beef one the toasted side of one slice of bread, and return to the pan un-toasted side down. Increase the heat to medium

Add the sauerkraut on top of the corned beef, then drizzle with mustard or ketchup

Add the cheese

Then add the lid, un-toasted side to the outside again, then flip with a turner/spatula

Toast for about 3-4 minutes. Slice and serve