Toast the English muffin in your toaster. In a medium sized skillet add the three to four pieces of thinly sliced corned beef. Heat the corned beef over a medium heat. If your skillet is not a non-stick skillet add about a teaspoon of butter and cook the egg in the melted butter. Season egg with salt and pepper. Flip the slices of corned beef over and add 1 slice of the Swiss cheese to the corned beef in the pan. Spread honey mustard onto the English muffin. Add corned beef with Swiss cheese to the muffin. Top corned beef with egg, and then add the remaining slice of Swiss cheese on top of the egg. Top with remaining bun.