Fill a medium-sized bowl with ice and water then set aside. Add eggs to a medium-sized saucepan then cover with water 1" above the tops. Bring water to a boil then place a lid on top and remove pan from heat. Let sit for 11 minutes then remove the lid and scoop eggs into the bowl of ice water and let cool.
Peel eggs then slice in half. Transfer yolks to a small bowl then stir in dressing and buffalo sauce until smooth. Cut egg white halves in half again to create quarters. Transfer egg yolk mixture to a ziplock bag, snip off the corner, then pipe onto egg white quarters. Set finished eggs aside.
For the Salad:
Brush chicken breasts with olive oil then season with garlic salt and pepper. Saute in a medium-sized skillet over medium-high heat until cooked through then let rest for 5 minutes before chopping into bite-sized pieces. Toss with 3-4 Tablespoons buffalo sauce then set aside.
Divide lettuce among 4 plates then layer on celery, tomatoes, buffalo chicken, avocado, and feta cheese. Add Buffalo Deviled Eggs on top then sprinkle with bacon.