Put your bacon on a sheet tray and cook at 425f for 20-25 minutes. In a bowl, mix mayo, chives, lemon zest, lemon juice, garlic and salt and pepper. Mix well and set aside.
In a pan over medium heat, add 1 Tbsp butter and toast your buns on both sides until golden brown. Set aside. Melt another Tbsp butter add your eggs, cover with a lid and cook for 2 minutes. Season with salt and pepper , then remove and set aside.
To assemble
To the bottom bun, add sauce, lettuce, tomato, bacon, egg, avocado. Top with sauced bun and enjoy!