Heat up oil in large cast iron pan (or pot) and saute onions and peppers for about 7 minutes on medium heat until some browning occurs.
Stir in pulled mushrooms until they are well mixed in with the peppers and onions. You might need to do this in a couple phases depending on the size of your pot.
Add barbecue sauce, apple cider vinegar, chili powder, thyme and garlic powder.
Stir all ingredients together and cook for about 20 minutes over medium-low heat stirring occasionally. You can keep them like this for even longer if you need/want to.
Serve on a soft bun (I used sourdough rolls from the far mar). if you want you can butter the inside of the bun for some extra decadence and you can also add sandwich pickles if that tickles your fancy