01 - Butter one side of each slice of rye bread evenly with softened butter.
02 - Heat a large skillet or griddle over medium heat until evenly warmed.
03 - Place 2 slices of bread, buttered side down, in the preheated skillet.
04 - Distribute half the corned beef, 2 slices Swiss cheese, and half the drained sauerkraut onto each bread slice in the pan.
05 - Spread 1 tablespoon of Russian or Thousand Island dressing on the unbuttered side of the remaining bread slices and place on top, dressing side down.
06 - Cook for 2-3 minutes per side, pressing gently with a spatula, until bread turns golden brown and cheese melts completely.
07 - Transfer sandwiches to a cutting board, slice diagonally in half, and serve immediately while hot.