01 -
Arrange the bread slices on a clean cutting board.
02 -
Distribute about 3/4 cup of leftover mac and cheese over two slices of bread, spreading evenly to the edges.
03 -
Top the mac and cheese on each sandwich with 1/4 cup shredded extra sharp cheddar cheese for added flavor and binding.
04 -
Place the remaining bread slices on top to form closed sandwiches.
05 -
Spread a thin, even layer of softened butter on the outer side of each sandwich.
06 -
Heat a nonstick skillet or griddle over medium-low heat.
07 -
Place sandwiches in the pan, buttered side down, and cook for 3 to 4 minutes per side, pressing gently, until golden brown and the cheese is melted.
08 -
Remove sandwiches from the pan, let rest for 1 minute, cut diagonally with a knife, and serve hot.