- Cover one side of each slice of bread with the mayonnaise and both types of mustard. Top with the cheese. Place the mashed potatoes on one slice of bread. Sprinkle with the chives and jalapeño. Close the sandwich.
- In a non-stick skillet over medium heat, melt the butter. Brown the sandwich for 3 to 4 minutes on each side or until the cheese has completely melted.
- Serve with a green salad and pickles, if desired.
We recommend heating the mashed potatoes in the microwave oven to help the cheese melt and the sandwich cook more quickly.