Mix the garlic powder, onion powder, paprika, salt and pepper in a small bowl and sprinkle over the brisket, patting it down all over the meat. Heat the avocado oil over medium high heat in a Dutch oven.
Mix the garlic powder, onion powder, paprika, salt and pepper in a small bowl and sprinkle over the brisket, patting it down all over the meat. Heat the avocado oil over medium high heat in a Dutch oven. Sear the brisket on all sides for about 5 minutes each side.
Place the brisket in a large bowl and cover the top and bottom with ⅔rds of the onion mixture. Place brisket, fat side up, in the slow cooker. Spread the dijon mustard over the top of the brisket and sprinkle the remaining ⅓rd of onion mixture over the top. Set slow cooker on low for 9 hours.
Braised Brisket for Rosh Hashana Tomorrow! Preheat the oven to 325°F. Season the brisket on both sides with salt and pepper. Add the oil to a large, heavy-bottomed, oven-safe saucepan or Dutch oven and heat over medium-high heat. Once the oil is hot, place the brisket in the pot and turn heat down to medium.