Another all time favorite.
butterSaute the mushrooms in butter.
Build sandwich by buttering outside of bread slices and then putting buttered sides together. On unbuttered side that is up, place a slice of swiss cheese, top with sauteed mushrooms, then with sauerkraut, and finally another slice of swiss cheese. Place butter side down in skillet over medium-low heat and place other slice on top. Cook until bread is crisp, then turn and cook other side the same. Fabulous served with homemade dill pickels!