A good grilled cheese sandwich is comfort food at its finest: easy to throw together and so tasty. This particular combination of tart green apple slices, smoky bacon, and tangy whole-grain mustard served between crispy bread with melted cheddar cheese is perfect twist to your standard sandwich.
1/4 cup (1/2 stick) unsalted butter, at room temperature
8 (1/2-inch-thick) slices white bread
4 teaspoons whole-grain mustard
1/2 pound cheddar cheese, shredded (2 cups)
12 slices applewood-smoked bacon, cooked until crisp
Granny Smith apple, thinly sliced
Preheat a grill pan or large skillet over medium-low heat.
Butter one side of each slice of bread. Put 4 of the slices on a cutting board, buttered side down, and spread 1 teaspoon of the mustard over the unbuttered side of each. Top the mustard with the cheddar, bacon, and apple, dividing them evenly among the bread slices. Top the sandwiches with the remaining slices of bread, buttered side up.
Put the assembled sandwiches on the grill pan. Cook until the cheese begins to melt and the bottom is golden brown, 3 to 5 minutes. Flip and cook the other side until golden brown, about 2 minutes.
Remove the sandwiches from the skillet, slice them in half, and serve hot.