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