In our family, we reverse the order... bread, cheese, tomatoes, and bacon on top (pre-cook bacon or it will burn when broiling)... then broil (low broil) for 5 or so mins until bacon is crisped and cheese is melting. We call these "Cheese Dreams" ... technically an open-face broiled sandwich... but it's been a family extra favorite for 50+ years!
I first made this using 7-grain toast and swiss cheese and popped it under the broiler to melt the cheese. I found this to be a bit dry. Then, I tried it with an herbed cream cheese spread on the toast prior to placing the bacon and tomatoes on top and broiling just a bit. This was much better. It is an easy snack that can be adjusted to personal tastes.