Place half of the chopped onions, 4 whole garlic cloves and bay leaves in the bottom of the slow cooker. Optional: Sautee onions for 5 minutes in pan to caramelize before placing in slow cooker.
Pat Brisket dry and sprinkle both sides very lightly with black pepper and salt. Don't overdue it as there is plenty of salt in the sauce.
Heat Large Skillet or Cast Iron Pan on high and drizzle oil into the pan. Place brisket in pan sear for 4-5 minutes per side or until browned. You could skip this step but browning the meat adds great flavour and highly recommended!
Once Browned, place the brisket in the slow cooker on top of the bed of onions and garlic. Drain fat from Skillet.
In a small bowl, mix together the broth (or water), salt, black pepper, paprika, turmeric, cayenne and Worcestershire. Pour mixture into the skillet over medium heat. Stir to to deglaze the pan and remove from heat when bubbles form.
Pour Mixture over Brisket then add remaining onion and garlic on top.
Cover and Cook on LOW for 10 hours until cooked through and tender, or as desired. If you prefer to enjoy the brisket in slices as opposed to shredded, consider removing at the 8-9 hour mark.
Remove Brisket from Slow Cooker and let rest for 20 minutes on cutting board.
Meanwhile, remove and discard access fat from surface of cooking sauce. Discard Bay Leaves.
Use the Immersion blender to blend the cooking sauce, garlic and onions to produce the delicious gravy. Alternatively, you can skip the blender and thicken remaining juices. To do so, mix 1 tbsp cold water with 1 tbsp cornstarch in a bowl. Stir mixture into strained liquid.
If you prefer to eat your brisket shredded, pull apart with forks. We enjoyed our Brisket in Slices by Slicing against the grain.
Pour Gravy over Brisket, as desired and Enjoy!