Pre-heat oven to 350 °F
Cut peppers in half lengthwise and remove the core and seeds. Place in a baking dish just big enough to fit the pepper halves or on a foil-lined tray. Sprinkle with salt and pepper and set aside.
Shred or chop rotisserie chicken and place in a bowl.
For the Buffalo sauce, mix together hot sauce, chili garlic sauce, Worcestershire vinegar, garlic powder, and sour cream until smooth. Stir into chicken until fully combined.
Stuff pepper halves with chicken mixture. Top with cheese and bake for 30 minutes.
Meanwhile, make the blue cheese dressing, Crumble blue cheese into a bowl. Add the mayonnaise, yogurt, and onion powder. Stir to combine well. If it's too thick for your liking add small amounts of water at a time to reach desired thickness. Set aside. You can also mix it in a blender or with a hand blender.
Serve the blue cheese dressing drizzled on top or on the side. Top with sliced green onions if desired.