4 tablespoons (1/2 stick) butter, softened
8 slices hearty white bread
8 slices (1/4 pound) American cheese
16 slices crisp, cooked bacon
8 slices (1/4 pound) Colby cheese

1. Spread butter evenly on one side of each piece of bread. Distribute American cheese slices and bacon equally over 4 slices of bread on the side without butter. Place Colby cheese slices over the bacon, and top with the remaining slices of bread, butter-side out.
2. Preheat a large skillet or griddle over medium heat. Cook sandwiches, in batches if necessary, for 2 to 3 minutes per side, or until golden and the cheeses are melted. Serve immediately.