Preheat your oven to 350°F (175°C).
In a slow cooker, combine the chicken breasts, barbecue sauce, ranch seasoning mix, olive oil, apple cider vinegar, and honey. Stir to coat the chicken evenly.
Cover and cook on low for 6-8 hours or on high for 3-4 hours, until the chicken is tender and easily shredded.
Once cooked, shred the chicken using two forks and mix it well with the sauce in the slow cooker.
Slice the slider buns in half and place the bottom halves on a baking sheet.
Spoon the shredded chicken mixture evenly over the bottom halves of the buns.
Sprinkle the shredded cheddar cheese on top of the chicken.
Place the top halves of the buns over the cheese.
Bake in the preheated oven for about 10-15 minutes, until the cheese is melted and the buns are lightly toasted.
Remove from the oven, add pickles if desired, and garnish with fresh parsley before serving.