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Add the ground beef and onions to a skillet over medium-high heat and sauté until browned and the onions have softened (about 8-10 minutes). Spoon out any excess fat.
Reduce the heat to medium. Stir in the butter, garlic powder, ranch seasoning, au jus seasoning, pepperoncini peppers, pepperoncini juice, and beef broth. Let it cook for another 3-5 minutes or so, stirring often, until the sauce thickens up to your liking (don't let it get too dry).
Serve as desired in toasted buns. To toast the insides of the buns, heat a tablespoon or two of olive oil in a skillet over medium heat, then add the buns and watch them closely until the insides have browned nicely (you'll need to do this in batches).