Preheat your oven to 300°F (150°C).
In a small bowl, combine the smoked paprika, garlic powder, onion powder, sea salt, and black pepper to create the dry rub.
Rub the spice mixture thoroughly over all sides of the beef brisket.
Place the brisket in a roasting pan, cover tightly with aluminum foil, and roast for 3 to 4 hours until the meat is tender.
While the meat rests, whisk together the apple cider vinegar, maple syrup, dijon mustard, and olive oil in a medium bowl.
Toss the shredded cabbage with the dressing and let it sit for 10 minutes to allow the flavors to meld.
Slice the brisket thinly against the grain and serve immediately with the tangy slaw.