1Preheat a skillet or griddle over medium heat.
Spread margarine evenly on one side of each bread slice.
Place 4 slices of bread, margarine side down, on the skillet.
Add 2 slices of cheese on top of each bread slice in the skillet.
Top with the remaining bread slices, margarine side up.
Grill until the bread is golden brown and the cheese has started to melt, about 3-4 minutes per side.
Flip the sandwiches carefully with a spatula and continue grilling until the other side is golden brown and the cheese is fully melted.
Remove from the skillet and let sit for a minute before cutting.
Cut the sandwiches diagonally and serve hot.