01 -
Combine chili powder, garlic powder, celery seeds, and black pepper in a small bowl to form the rub.
02 -
Rub the seasoning evenly over the entire surface of the beef brisket, ensuring thorough coverage.
03 -
Wrap the seasoned brisket in plastic wrap and refrigerate overnight to deepen flavor, if time allows.
04 -
In a separate bowl, mix ketchup, chili sauce, brown sugar, dry mustard, apple cider vinegar, Worcestershire sauce, and liquid smoke until well combined.
05 -
Place the rubbed brisket into the bottom of a 6-quart slow cooker. Pour the sauce over the meat, coating thoroughly.
06 -
Cover and cook on low heat for 6 to 8 hours until the brisket is tender.
07 -
Remove the cooked brisket and slice thinly across the grain to ensure tenderness.
08 -
Optionally drizzle reserved cooking liquid over the sliced brisket before serving to enhance moisture and flavor.