Trim the brisket and slice into two pieces to fit into the slow cooker. Cover with Bone Suckin’® Seasoning and Rub and place in a plastic bag and refrigerate for 2 to 8 hours.

When ready to cook, slice the onion and place a thick layer in the bottom of the cooker. Place half of the brisket in cooker on top of the onions. Mix together Bone Suckin’ Sauce® and the onion soup mix. Spread half of the mixture over the brisket. Add an additional layer of onions and brisket. Pour the remaining mixture over the brisket.