Heat a griddle pan or cast-iron skillet. Brush 4 slices of bread with melted butter. Turn two pieces of bread over and place ½ of the cheese on each piece. Place the other 2 pieces of bread on top of the cheese, butter side up.
Grill the sandwiches on one side for about 3 minutes on medium-high heat, adding a little weight or pressing the sandwich down while cooking. Turn the sandwiches over and cook for another 2 to 3 minutes, or until cheese is melted and bread is nicely browned.
Remove sandwiches to a cutting board and allow to rest for about 2 minutes. Cut each sandwich into one-inch cubes.
Notes
These croutons are perfect in tomato soup or with a panzanella salad.
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