1Preheat a skillet over medium heat.
Cook the bacon in the skillet until crispy, about 5-7 minutes. Remove and drain on paper towels.
Toast the slices of whole grain bread until golden brown.
Spread 1 tablespoon of mayonnaise on one side of each slice of bread.
Place 2 slices of bacon on 4 of the bread slices.
Add a leaf of romaine lettuce on top of the bacon.
Place 2 slices of tomato on top of the lettuce.
Top with the remaining slices of bread, mayonnaise side down.
Cut each sandwich in half and serve immediately.