Prep the avocados: Halve the avocados and remove the pits. Scoop out 1–2 tablespoons from the center of each half to make a larger well.
Dice the scooped avocado and set aside for the filling.
Mix the sauce: In a bowl, whisk together buffalo sauce, ranch dressing, and Greek yogurt or mayonnaise. Taste and adjust with more buffalo for heat or more ranch for cooling.
Build the filling: Add shredded chicken, diced celery, green onions, and the reserved diced avocado to the bowl. Fold gently to coat everything in the buffalo ranch mixture.
Season: Add lemon or lime juice, a pinch of salt, and pepper.
Stir and taste. If you want it richer, add a little more ranch; if you want more tang, add a splash more citrus.
Add cheese (optional): Fold in blue cheese crumbles for a classic buffalo flavor or use Monterey Jack for a milder, melty vibe.
Stuff the avocados: Spoon the chicken mixture into each avocado half, mounding it slightly.
Finish and serve: Drizzle with extra buffalo or ranch if you like, and sprinkle with cilantro or parsley. Serve immediately for the best texture.