Preheat a skillet over medium-high heat.
Combine lettuce, carrots and celery in a salad bowl. Combine ranch dressing and blue cheese crumbles in a small bowl.
Add oil and butter to hot pan with the chicken. Season with salt and pepper and sear for 2 or 3 minutes, then add hot sauce. Reduce heat a little and cook 5 minutes more.
Toss salad with dressing and season with salt and pepper. Top salad with Buffalo chicken and serve.