Toast the sliced sourdough bread. Spread each slice evenly with Duke’s Mayonnaise and stack with Bibb lettuce and tomato slices. Slice the avocado and add slices on the bottom layer.
Add half the bacon and cheddar to the bottom layer and toast lightly to melt the cheese. Add the second slice of sourdough and repeat.
Then, top with the third sourdough slice. For best results, melt the cheese on top of the bacon slices in two sets on a pan under a broiler before assembling your sandwich.