Ingredients:

  • 2 lbs lean ground beef (85/15 ratio)
  • 0.5 cup Panko breadcrumbs
  • 1 large egg, beaten
  • 1 oz Lipton Onion Soup Mix (1 packet)
  • 0.25 cup whole milk
  • 1 tbsp Worcestershire sauce
  • 0.5 tsp black pepper
  • 2 cups low-sodium beef broth
  • 1 cup cremini mushrooms, sliced
  • 1 large yellow onion, thinly sliced
  • 2 tbsp tomato paste
  • 2 tbsp cornstarch
  • 2 tbsp unsalted butter
  • 2 tbsp water

Instructions:

  1. In a large bowl, combine the 2 lbs ground beef, 0.5 cup Panko, beaten egg, 0.25 cup milk, 1 oz onion soup mix, 1 tbsp Worcestershire, and 0.5 tsp pepper. Mix with your hands until just combined.
  2. Form the mixture into 6 oval patties about 1 inch thick.
  3. Heat 1 tbsp butter in a skillet over medium high heat. Sear the patties for 3 minutes per side until a dark brown crust forms. You aren't cooking them through yet, just building flavor.
  4. Remove the patties and set aside. In the same skillet, add the remaining 1 tbsp butter, the 1 cup sliced mushrooms, and the sliced yellow onion. Sauté for 5 minutes until the onions are translucent and mushrooms soften.
  5. Whisk the 2 tbsp tomato paste into the 2 cups beef broth. Place the seared patties into the slow cooker. Pour the onion and mushroom mixture over the beef, then pour in the broth mixture.
  6. Cover and cook on Low for 6 hours.
  7. About 20 minutes before serving, whisk the 2 tbsp cornstarch with 2 tbsp water. Stir this slurry into the crockpot liquid until the sauce thickens and becomes glossy.