1. Preheat the oven to 250°F.
2. Place two slices of swiss cheese on each of two pieces of bread.
3. Place the two cheese-covered slices of bread in the oven, plus two more pieces of bread if you want a closed-face sandwich. Cook for about 5 minutes or until cheese is just melted.



4. In a skillet over medium-low heat, cook Serrano ham until crispy, turning once, about 5 minutes.
5. Turn burner to low, add the two eggs, and cook sunnyside up. Alternately, if not using the ham, melt 1 tablespoon butter over low heat, then add the eggs.
6. When the yolks have just started to firm up but are still runny, drizzle the balsamic reduction sauce atop the eggs. Place a lid over the skillet and cook for an additional 30 seconds. Remove from heat.



7. On each piece of cheese-topped bread, add 1 cup mixed greens and top with the fried egg. If using the ham, top each egg with the Serrano ham and a second slice of bread.

Makes 2 open-face or closed-face sandwiches.