Load your Z Grills pellet hopper with Cherry Wood Pellets and set the smoker up to run at 300°F.
While the grill is heating, cut/slice up your bell peppers and onion.
Cut stick butter up into tabs and place in cast iron pan/skillet.
Pour in olive oil (enough to coat the bottom of the pan), add in the sliced bell peppers and onions and add in the desired amount of BBQ seasoning.
Stir up all contents of the pan to ensure everything is coated in the butter, olive oil and BBQ seasoning.
Once your Z Grills pellet smoker is up to temp, put a pan/skillet of peppers and onions on and put the 6 brats on the grill. Insert a temp probe into one of the brats. About 15 minutes in, stir up everything in the pan.
When the temp of the brats reaches about 130°F, give them a flip and stir everything in the pan again to ensure even cooking. When brats are at about 150°F, put the buns on the grill to toast them up if you desire.
Once brats reach an internal temp of 165°F, they are ready to take up. Take up buns when they are toasted to your liking and put brats in the pan with peppers and onions.
Put spicy brown mustard in a bun, add a brat, and top with peppers and onions.