Place the chicken breasts in the bottom of your Crockpot. Sprinkle the au jus mix and ranch seasoning mix over the chicken.
Add the chopped onions on top of the chicken. Then, add the tangy pepperoncini peppers, pepperoncini juice, and low-sodium chicken broth, and butter.
Cover the Crockpot with its lid and set it to cook on low heat for 6-8 hours or on high heat for 3-4 hours. Make sure that the chicken reaches an internal temperature of 165 degrees F (74 degrees C) for safety.
Once the chicken is cooked through and tender, shred and serve it in a sandwich bun or with mashed potatoes, over a bed of rice or cauliflower rice, egg noodles, and green beans.
Notes
Optional Thickening: If you prefer a thicker sauce, remove the chicken from the crockpot once it's cooked and then mix in a cornstarch slurry (1 tablespoon cornstarch mixed with 1 tablespoon cold water) into the liquid in the crockpot. Turn the crockpot to high and let it cook for about 15-20 minutes until the sauce thickens.
This nutrition information is based on the exact products I used in this recipe. Brands and sizes of products could alter exact nutrition and should always be calculated independently.