Step 1

In small bowl, mix brown sugar, chipotle chili powder, cumin, celery salt, garlic powder, salt and pepper.

Step 2

Spray inside of 6-quart slow cooker with cooking spray. Place brisket in slow cooker; rub mixture all over brisket.

Step 3

In another small bowl, mix 3/4 cup of the ketchup, the apple cider vinegar, onion and Worcestershire sauce. Pour over brisket along with broth.

Step 4

Cover and cook on Low heat setting 6 to 8 hours or until meat thermometer inserted in center of brisket reads 160°F.

Step 5

Transfer brisket to cutting board; let stand 10 minutes. Meanwhile, add remaining 3/4 cup ketchup to sauce in slow cooker; stir to combine.

Step 6

Thinly slice brisket; transfer to serving plate. Spoon sauce over top.