Preheat your grill or oven to 375°F (190°C).
Coat the chicken thighs with oil and season with salt, pepper, garlic powder, and cayenne.
Sear the chicken over high heat for 2–3 minutes per side until browned.
Move to indirect heat, brush with buffalo sauce, and cook until internal temperature reaches 165°F (75°C).
Remove chicken, let rest, then cut into bite-sized pieces.
In a bowl, mix all blue cheese sauce ingredients until smooth and creamy.
Prepare crispy fries according to your preference.
Place fries on a serving dish and top with shredded cheese. Melt slightly.
Add buffalo chicken pieces on top and drizzle with more buffalo sauce.
Finish with blue cheese sauce, crumbles, and chopped chives.
Serve your buffalo chicken fries immediately while hot.