Trim the chicken breast and season with the spices, rubbing them on all sides.
Place the chicken in the slow cooker. Combine the ketchup, melted butter, and vinegar together, then pour over the chicken.
Add the honey and place the lid on the pan. Cook on high for 4 hours or low for 6.
Stir the cornstarch with a spoon of water and mix into the crockpot. Cook for another 20 minutes or until the sauce has thickened.
Using 2 forks or a hand mixer, shred the chicken.
Serve the chicken on buns with pickles and some onion.
Notes
Place any remaining cooked chicken in an airtight container and store in the fridge for up to 4 days. Reheat it on the stovetop over medium heat until warmed throughout.