Thinly slice the baguette into ½" slices and place on a baking sheet. Bake for 5-7 minutes until the bread has a slight crunch. Remove from oven.
Heat the tempeh bacon according to package directions (or follow these directions to make mushroom bacon)
Mix together the mayonnaise and garlic (if usings) and spread a thin layer onto each baguette slice. Top with lettuce, bacon, and tomatoes. Serve the same day.