Preheat your smoker to 225 degrees F using oak or hickory wood for an authentic Texas flavor.
Trim the beef brisket of excess surface fat, leaving a thin layer to keep the meat moist during the long smoke.
In a small bowl, combine the sea salt, black pepper, garlic powder, and onion powder to create a clean dry rub.
Apply the spice rub generously to all sides of the brisket, pressing it into the meat to ensure it adheres.
Place the brisket in the smoker and cook until the internal temperature reaches 165 degrees F.
Wrap the brisket tightly in unlined butcher paper and return it to the smoker until the internal temperature reaches 203 degrees F.
Remove the brisket from the smoker and let it rest for at least 30 minutes before slicing against the grain.
While the meat rests, toss the green beans with olive oil and roast at 400 degrees F for 12 minutes until tender-crisp.
Slice a 6-ounce portion of the brisket and serve immediately alongside the roasted green beans.