Preheat the oven to 350F and position the top oven rack in the middle of the oven. Line a sheet pan with parchment paper.
In a medium bowl, combine the rotisserie chicken with the Buffalo sauce until the shredded chicken is coated well. If using chopped chicken breasts or thighs, chop the chicken into small pieces first.
Assemble the nachos:
Spread the tortilla chips on the parchment paper. Sprinkle half of the shredded cheese over the tortillas and half of the blue cheese. Top with the Buffalo chicken.
Distribute the remaining shredded cheese and blue cheese over the nachos.
Melt ’em
Place the layered nacho tray in the preheated oven and bake it for 10 to 12 minutes until the cheese looks melty and the chicken is warm. Remove the tray from the oven.
Serve:
Drizzle the Ranch sauce over the nachos and sprinkle chopped green onions over the top.
Enjoy the nachos from the baking sheet, or gently lift the parchment paper and slide a wooden board big enough to hold the nachos underneath.