Place the boneless, skinless chicken breasts in the bottom of the crockpot.
In a mixing bowl, combine the ranch dressing mix, cream of chicken soup, chicken broth, and sour cream. Mix well until smooth.
Pour the creamy ranch mixture over the chicken in the crockpot, ensuring the chicken is well-coated.
Season with salt and pepper to taste.
Cover the crockpot with a lid and cook on low for 6 hours or high for 3 hours until the chicken is tender and cooked through.
About 15 minutes before serving, sprinkle the shredded cheddar cheese on top of the chicken and allow it to melt.
Once done, shred the chicken in the crockpot using two forks and stir the creamy sauce to combine.
Serve hot, garnished with chopped green onions if desired.