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Tender Slow Cooker Corned Beef Recipe with Mustard Glaze

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This easy slow cooker corned beef recipe yields melt-in-your-mouth brisket finished with a tangy, sweet mustard glaze. Perfect for family dinners, holidays, or cozy gatherings, it’s a comforting classic with a modern twist.

Ingredients

Scale
  • 3–4 lbs corned beef brisket (flat cut preferred, with spice packet)
  • 1 large yellow onion, sliced
  • 4 garlic cloves, smashed
  • 3 large carrots, peeled and cut into chunks
  • 1 lb small red potatoes, halved
  • 2 cups beef broth (low-sodium preferred)
  • 2 bay leaves
  • 1 tsp whole black peppercorns (optional)
  • Corned beef spice packet (from brisket)
  • 1/3 cup Dijon mustard
  • 1/3 cup brown sugar, packed
  • 2 tbsp apple cider vinegar
  • Freshly cracked black pepper, to taste

Instructions

  1. Scatter sliced onion, carrots, and potatoes evenly in the bottom of your slow cooker.
  2. Rinse corned beef brisket under cold water and pat dry. Place brisket, fat side up, on top of vegetables.
  3. Sprinkle spice packet, smashed garlic, bay leaves, and peppercorns over brisket. Pour beef broth around the meat.
  4. Cover and cook on low for 8-9 hours (or high for 5-6 hours) until beef is fork-tender.
  5. About 30 minutes before beef is done, whisk together Dijon mustard, brown sugar, apple cider vinegar, and cracked black pepper in a small bowl.
  6. When brisket is done, transfer to a broiler-safe baking sheet. Brush top and sides generously with mustard glaze.
  7. Broil on high for 2-4 minutes, watching closely, until glaze is bubbling and golden.
  8. Tent beef with foil and let rest for 10 minutes before slicing against the grain.
  9. Arrange slices on a platter with vegetables. Drizzle with leftover glaze or cooking juices if desired.

Notes

For gluten-free, double-check mustard and broth labels. Add cabbage wedges in the last hour if desired. If you don’t have a broiler, finish the glazed brisket in a hot oven (450°F) for 5-8 minutes. Leftovers are great for sandwiches. Rinse brisket before cooking to avoid excess salt.

Nutrition

Keywords: corned beef, slow cooker, crockpot, mustard glaze, family dinner, St. Patrick's Day, comfort food, easy recipe, beef brisket, gluten-free

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