Heat 1 tbsp of oil in a large pan over medium-high heat. Cook onions, stirring occasionally for 15-20 minutes until golden brown. Remove onions from pan and reserve.
Wipe clean the pan. Heat remaining oil in pan until smoking. Sear beef on all sides until dark brown. Remove from pan and reserve.
Place the brisket in a slow cooker and smother with onions.
Mix together the iSpice WellnessTM Meat Sauce Seasoning,* broth, mustard, and Worcestershire sauce and pour over brisket.
Cook brisket in slow-cooker turned to LOW setting for 8 hours until very tender.
Before serving, let brisket rest on WARM for 15 minutes.
Serve hot over mashed potatoes.
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