Cook bacon slices until they are crispy and drain excess grease. I bake my bacon slices in the oven at 400F for 20-22 minutes on a baking sheet lined with parchment paper or in an air fryer. While the bacon is cooking, prepare the other ingredients.
Thinly slice the cooked chicken breast on an angle. The thinner the better for an easy to eat sandwich. Grilled or roasted chicken both work great for this sandwich. A rotisserie chicken from Costco is a perfect shorcut here.
Cut the French roll in half through the center. Spread butter in the cut side of each half and lightly season with salt. Place on a baking sheet and place under a broiler set to LOW for 3 minutes or until the roll has lightly toasted to a golden brown.
Prepare the avocado, lettuce and tomatoes. Slice the avocado. Shred the lettuce into thin bite sized pieces. This allows the blue cheese dressing to thuroughly coat the sandwich ingredients. Slice the tomato to desired thickness. I like mine very thin.
Assemble the sandwich. Spread a thin layer of blue cheese dressing on each side of the toasted roll. On the bottom roll, layer the sliced chicken, crispy bacon, avocado, tomatoes, shredded lettuce, and more blue cheese dressing. Cover with the top roll and cut through the center on a diagonal for easy eating.
Serve this sandwich with potato wedges or sweet potato fries.