Preheat your smoker to 275° F using cherry wood for sweet smoke flavor.
Use yellow mustard as a binder then season the chuck roast on all sides with salt, pepper, garlic powder.
Place the chuck roast on the smoker for 3 hours.
Remove from smoker once the roast reaches an internal temp of 165° F.
Place the roast in the Dutch oven, then add the diced onions, cherry cola.
Put the lid on the Dutch oven then let it braise on low for an additional 2 hours.
After for 2 hours, remove the lid then add the bbq sauce. Let it cook uncovered for another hour until the roast reaches 200° F and is probe tender.
Shred the beef then serve on a croissant with pickled jalapeños and fried onions.