Slow Cooker Beef Brisket (Tender and Saucy)

Ingredients

• 3 1/2 lb (1.6 kg) flat-cut beef brisket, trimmed to a 1/4-inch fat cap
• 1 1/2 teaspoons kosher salt
• 1 teaspoon black pepper
• 2 teaspoons smoked paprika
• 1 teaspoon chili powder
• 1 teaspoon onion powder
• 1/2 teaspoon dried thyme
• 1 tablespoon olive oil
• 1 large yellow onion, thinly sliced
• 4 cloves garlic, minced
• 1 cup (240 ml) low-sodium beef broth, gluten-free if needed
• 1/2 cup (120 g) ketchup
• 2 tablespoons tomato paste
• 2 tablespoons apple cider vinegar
• 2 tablespoons packed light brown sugar
• 1 tablespoon Worcestershire sauce, gluten-free if needed
• 1 tablespoon Dijon mustard
• 1 bay leaf