# How-To Steps:
01 - Arrange bread slices on a clean surface.
02 - Spread a thin, even layer of mayonnaise on one side of each bread slice.
03 - If using, spread a thin layer of Dijon mustard on the opposite side of two bread slices.
04 - Place two cheese slices between two bread slices, ensuring mayonnaise sides face outward; repeat for the second sandwich.
05 - Warm a nonstick skillet over medium-low heat.
06 - Place sandwiches mayo-side down in the skillet and cook for 3 to 4 minutes or until golden brown.
07 - Flip sandwiches, press gently with a spatula, and cook for another 3 to 4 minutes until bread is golden and cheese is melted.
08 - Remove sandwiches from skillet, let rest for 1 minute, then slice and serve immediately.