Slather one side of each piece of bread with mayonnaise. Set plain side up (slathered side down).

Heat a griddle or skillet to medium heat (325°F for griddle) and add the sandwiches, pressing down to get maximum surface space in contact with the pan and cheese to melt and stick. Cook for 1-2 minutes or until bread it lightly browned. Flip and repeat on the other side.

Grilled cheese can be stored wrapped tightly in plastic wrap or aluminum foil or in an airtight container. They are best reheated in a hot skillet on the stove. Microwaving can make the bread rubbery and dry.