Slow cookers are great for cooking certain cuts of meat until they easily pull apart (i.e. chicken thighs). Chipotle in adobo adds a bold layer of smoke and heat to many Mexican dishes, so we’re adding some to this barbecue sauce to dial up the flavor.
Achieving crispiness on the pulled chicken after slow cooking is key for texture; ensure the skillet is hot and don't overcrowd the pan when browning. The grated onion in the slow cooker sauce adds flavor without large chunks. Properly separating the fat from the slow cooker liquid concentrates the sauce's flavor. For the slaw, tossing it just before serving keeps the cabbage crisp. Broil the sandwiches just until the cheese is melted and bubbly to avoid burning the buns.