Preheat oven to 425°F. Dice potatoes, onion, and chicken.
Add to a sheet pan and toss with olive oil and spices. Spread evenly.
Bake for 25 minutes, tossing halfway, until chicken is cooked through.
Mix yogurt, vinegar, blue cheese, salt, and pepper for the sauce.
Toss chicken with buffalo sauce. Drizzle blue cheese sauce on top and garnish with green onions.
