Melt the butter in the skillet over medium heat. Toast the bread in the butter until lightly browned then remove from the heat and set aside.
2 slices sourdough bread, 1 tsp butter
Wrap corned beef in foil with a little water, then steam in the preheated oven for 5 minutes. Steam the sauerkraut in a separate foil.
4 ounces corned beef, 1/4 cup sauerkraut
Add about 1 tbsp spicy aioli to one slice of toasted bread. Add steamed corned beef on top of the aioli. Add the cheese to the other slice. Return to the oven until the cheese is melted.
2 tbsp Spicy Aioli, 2 slices baby Swiss cheese
Add warm sauerkraut or pickle slices, then assemble the sandwich. Slice in half and serve with potato chips or homemade potato salad.