Clean the chicken breasts under cold water and pat them dry with paper towels.
Ensure the butter is sliced into manageable pieces for even melting.
Place the chicken breasts at the bottom of the crockpot, ensuring they are evenly spread out. Pour the chicken broth and pepperoncini juice over the ingredients in the crockpot, ensuring a good distribution. (*Special note: if you want a spicier chicken dish use a cup of pepperoncini juice and leave out the broth. If you want a more mild version, leave out the pepperoncini juice and use a cup of broth)
Sprinkle the au jus gravy mix and ranch dressing mix over the chicken.
Place the pepperoncini peppers on top of the chicken mixture.
Place the slices of butter atop the other ingredients, spacing them out for even melting.
Cover the crockpot with the lid. Cook on a low setting for about 4-6 hours, or until the chicken is tender and fully cooked.
Once cooked, use two forks to shred the chicken, it should pull apart very easily. Stir the ingredients to mix the flavors and serve!
*Ensure the chicken is cooked to an internal temperature of 165°F.