Sous Vide Buffalo Chicken Sandwich

Ingredients

• 2 bone-in chicken breast halves
• Kosher salt and freshly ground black pepper
• ¼ cup (59 ml) hot or wing sauce
• 4 ounces (118 ml) crumbled blue cheese
• 1/2 cup (118 ml) Greek yogurt
• 1 tablespoon (15 ml) minced shallot
• 1 tablespoon (15 ml) lemon juice
• 1 tablespoon (15 ml) olive oil
• 1 cup (237 ml) celery leaves
• 1 cup (237 ml) thinly sliced celery stalks
• 4 egg buns