Start by prepping everything you'll need to go into the slow cooker. Spray the bottom and sides of your slow cooker with non-stick spray to make cleanup easier. Trim any excess fat off the chicken breasts, then lay them flat inside the crock.
The magic of this recipe lies in layering the flavors without needing to stir constantly. Mix the cayenne, smoked paprika, and garlic salt in a small bowl, then sprinkle the seasoning blend generously over the chicken. After that, scatter the brown sugar over the top, drizzle on the honey, add the vinegar, and place the pats of butter on top of it all. This step ensures that every piece of chicken cooks in that sweet, tangy, and spicy sauce.
Cover the slow cooker with its lid and set it to cook. Use the low setting if you have 4 hours to spare or the high setting if you need it done in 2 hours. The low-and-slow method will yield slightly juicier results, but both work wonderfully.
Once the chicken is tender and fully cooked, use tongs or two forks to shred it directly in the slow cooker. The juices will soak into every shred of chicken, ensuring maximum flavor. To serve, pile the shredded chicken high onto your favorite buns and top with crunchy pickles or any other toppings you like.