Place bacon in a large, deep skillet. Cook over medium high heat until evenly brown. Drain, and set aside.

Heat a large skillet over medium heat. Spread butter onto one side of each slice of bread. Lay 4 slices of bread, butter side down, in the skillet. Top with a slice of cheese, 2 slices tomato, bacon, and another slice of cheese. Cover with a slice of bread, butter side out. Fry sandwiches until golden on both sides.