Combine ground beef and egg in a large bowl until evenly combined, careful to not overwork the beef
Form 4 evenly round burger patties from the beef mixture and place them on a plate
Season burger patties on both sides with mixture of kosher salt, pepper, and garlic powder
Place burgers on the smoker and close the lid. Cook until they reach an internal temperature of 140ºF, measuring temperature occasionally with a probe thermometer. This part can take about an hour or maybe a little longer
Remove burgers from grate and increase heat to at least 375ºF, ideally closer to 450ºF
Place burgers back on grate for a quick sear, about 1-2 minutes per side or until a dark crust forms
(Optional but recommended) Toast your buns on the smoker grate
Remove burgers from smoker and let them rest for 5 minutes. Then assemble your burgers, serve, and enjoy!