Preheat oven to 450
Place bacon in single layer in a roasting pan. Roast for 15-20 minutes, checking every 5 minutes and turning occasionally.
Remove from pan and set on paper towel to drain excess fat.
Drain off the fat from the roasting pan. Give it a quick wipe with a paper towel, leaving a thin layer of fat on the pan. Set potato roll face down on pan. Set pan back in oven and toast roll for 5 minutes. Check halfway through to make sure it's not burning. Remove from oven and place face up on a plate.
Cut bacon strips in half. This'll help them fit within the roll.
Spread each side of the potato roll with mayo. To the bottom portion of the roll, add tomato, bacon in a stacked fashion, lettuce and then avocado. Place the top of the potato roll on and serve.