Preheat smoker to 250F
Prepare chuck roast by removing the hard fat both on the inside and outside. Cut entire chuck roast into 5 or 6 even sized pieces. Season with your favorite BBQ Seasoning, and allow the seasoning to sit on the meat for 15-20 mintues
Place meat on the preheated smoker directly on the grates and allow to smoke for about 1 hour. After an hour the meat will be dry on the outside and be ready for some moisture. Spritz with water or beef broth and allow to continue smoking until meat reaches 165F internal.
Place the meat in a covered pan or Dutch oven with 8 oz of beef broth and the onion Let that cook at 250F for about 2 hours. Check at the 2 hour mark to make sure the meat is fall-apart tender. If it is, pull and rest for 30 minutes. If not, allow to cook for another 15-20 minutes and check again.
In the last few minutes - slice your buns in half and place in oven under broiler for about 3-5 minutes until toasted to your liking.
Once meat is done cooking and rested, shred by hand or with forks and mix well with your favorite BBQ Sauce. Place onto split Hawaiian Slider buns and layer provolone on top. Place top buns on and brush with melted butter and top with sesame seeds. Place in heated oven for about 5 - 7 minutes to melt the cheese and toast the bread.
Serve hot, and watch them disappear quickly!