Prep the slow cooker: Lightly grease the insert with a little butter or oil to prevent sticking and make cleanup easier.
Layer the chicken: Place the chicken breasts (or thighs) in a single layer. Pat them dry for better seasoning and texture.
Make the sauce base: In a bowl, whisk together buffalo sauce, melted butter, garlic powder, onion powder, smoked paprika, salt, and pepper.
If using apple cider vinegar or lemon juice, add it now.
Pour and cook: Pour the sauce over the chicken. Cover and cook on Low for 4–5 hours or High for 2.5–3 hours, until the chicken shreds easily with two forks.
Add creaminess (optional): Turn the slow cooker to Warm. Stir in the softened cream cheese and ranch or blue cheese dressing, if using, until smooth and fully melted.
Shred the chicken: Transfer the chicken to a cutting board and shred with two forks.
Return it to the slow cooker and toss with the sauce until evenly coated. Taste and adjust salt or heat as needed.
Serve: Spoon into lettuce cups, onto cauliflower rice, into a low-carb wrap, or on top of a salad. Garnish with green onions, blue cheese crumbles, or celery for crunch.