Preheat Oven: Preheat your oven to 375°F (190°C). Lightly grease a 9x13-inch baking dish with olive oil.
Prepare Peppers: Cut the bell peppers in half lengthwise and remove the seeds and membranes. Place them in the baking dish, cut side up.
Make Filling: In a large bowl, combine shredded chicken, buffalo sauce, cream cheese, 3/4 cup shredded cheddar cheese, blue cheese crumbles, celery, green onions, garlic powder, onion powder, salt, and pepper. Mix well.
Stuff Peppers: Fill each pepper half with the chicken mixture, pressing down gently to pack the filling.
Top with Cheese: Sprinkle the remaining 1/4 cup shredded cheddar cheese over the top of each pepper.
Bake: Cover the baking dish with foil and bake for 20 minutes. Remove the foil and bake for an additional 10-15 minutes, until the peppers are tender and the cheese is bubbly and golden.
Serve: Let cool for 5 minutes before serving.
Notes
For a spicier kick, add extra buffalo sauce or a pinch of cayenne pepper.
Use cauliflower rice for a low-carb option.
Store leftovers in an airtight container in the fridge for up to 4 days or freeze for up to 3 months.