Heat indoor or outdoor grill to medium-high.
Spray chicken with cooking spray and season with salt, pepper and paprika. Grill to cooked through, about 12 minutes or so.
Melt butter in a skillet and add enough hot sauce to coat the chicken. Slice chicken into bite-sized pieces and toss it in the sauce.
For the dressing, whisk buttermilk with yogurt, lemon juice, herbs, salt and pepper. Stir in blue cheese.
Line a platter or base plate with a salad of lettuce, carrots and celery. Dollop dressing over salad, top with buffalo chicken and garnish with scallions.