The mashed potato sandwich is a delicious and comforting dish that combines the creamy goodness of mashed potatoes with the satisfying crunch of bread. It is a simple yet flavorful sandwich that can be enjoyed for breakfast, lunch, or dinner. The mashed potatoes are seasoned with herbs and spices, and spread onto bread slices. The sandwich is then grilled or toasted until golden and crispy. Serve it with a side of pickles or a salad for a complete meal.