Prepare all of the ingredients. Preheat smoker to medium-high.
Wrap each potato in aluminum foil, then use a fork to poke several holes into each potato. Place in smoker right away (during the preheat process).
In a large cast iron skillet, over medium high heat, add avocado oil, onions, and garlic. Saute for 3 minutes then add beer and broth. Stir to combine. Then lay sausages over top. Loosely cover skillet with aluminum foil and transfer to preheated smoker. Close the lid and let cook for 40 minutes.
Remove potatoes and skillet from smoker. Unwrap potatoes and add to a bowl. Add salt, pepper and butter, then mash potatoes, leaving them "rustic" or "chunky".
Serve potatoes with sausage on top and ladle over onion gravy.