In a small bowl combine the yogurt, scallions and blue cheese. Mix well and set aside.
In a small bowl combine paprika and chili powder, rub all over the chicken. Lightly coat a skillet with cooking spray heat on med-low, place the chicken breasts into the skillet and cook each side for 6 minutes. Add the hot sauce and olive oil, mix all together and bathe the chicken in the sauce, cook for another 3 minutes on low heat turn frequently to coat evenly.
Toast hamburger buns then smear one side of each bun with avocado, sprinkle a little salt and pepper. On the other half of the bun, place the cooked chicken breast. Spoon out the blue cheese dip and plate the celery, that's it. This Buffalo Chicken Sandwich with Blue Cheese Dip recipe is an easy weeknight meal everyone will love.