Heat bacon according to package directions until crisp.
Stir together cheese, mayonnaise, and garlic.
Spread mayonnaise mixture evenly onto 1 side of each bread slice.
Layer 3 bread slices, mayonnaise sides up, with 3 bacon slices each. Top bacon evenly with 1 bread slice, tomato slices, and basil. Top each with remaining bread slices, mayonnaise sides down.