Preheat oven to 375. Wash chicken and pat dry. Drizzle with olive oil and season with salt and pepper. Cook for about 23 minutes or until the internal temp is 165. Once cool enough to touch, use two forks to shred the chicken into bite sized pieces.
Cook the bacon until crispy and chop into bite-sized pieces. Alternatively, if you are adding to a sandwich, you can keep bacon in strips and add to the sandwich.
Make the ranch dressing by combining buttermilk, sour cream, mayo, chopped herbs, garlic powder, lemon juice, salt and pepper in a bowl, Whisk until smooth and combined.
Add the shredded chicken, banana peppers and celery to the ranch and mix until combined and creamy. Season to taste.
If turning the chicken salad into a sandwich, we liked to melt cheddar on sourdough bread and add a few scoops of the chicken salad along with arugula, slices of fresh tomato. Close and serve.