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A close-up, vertical shot of a succulent beef chuck roast inside a cream-colored Dutch oven. The meat is fork-tender and surrounded by a thick, dark brown gravy filled with whole sautéed mushrooms and jammy caramelized onions. A fresh sprig of green rosemary sits on top of the roast, with more herbs scattered on the dark wooden table nearby.

Slow Cooker French Onion Pot Roast with Mushrooms

This Slow Cooker French Onion Pot Roast is the definition of comfort in a bowl. A tender beef chuck roast is slow-cooked until it falls apart at the touch of a fork, surrounded by a rich, dark gravy made from caramelized onions and earthy whole mushrooms. Infused with fresh rosemary and thyme, this hearty meal delivers all the deep flavors of French onion soup in a satisfying, high-protein dinner.
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Prep Time 20 minutes
Cook Time 8 hours
Total Time 8 hours 20 minutes
Servings: 6
Course: Main Course
Cuisine: American
Calories: 520
Ingredients Method

Ingredients
  

  • 3-4 lb beef chuck roast
  • 2 lbs yellow onions thinly sliced
  • 1 lb cremini or button mushrooms halved or whole
  • 4 cloves garlic minced
  • 2 cups beef broth
  • 1/2 cup dry red wine optional, or extra broth
  • 2 tbsp balsamic vinegar
  • 1 tbsp Worcestershire sauce
  • 1 tbsp brown sugar
  • 2 sprigs fresh rosemary
  • 4 sprigs fresh thyme
  • 2 tbsp olive oil
  • 2 tbsp cornstarch mixed with 2 tbsp cold water for thickening
  • Salt and black pepper to taste

Method
 

  1. Season the beef chuck roast generously with salt and black pepper on all sides.
  2. Heat olive oil in a large skillet over medium-high heat. Sear the roast for 4-5 minutes per side until a deep brown crust forms.
  3. Transfer the roast to a 6-quart slow cooker.
  4. In the same skillet, add the sliced onions. Cook for 5 minutes until they begin to soften and pick up the browned bits from the meat.
  5. Place the onions, mushrooms, and minced garlic into the slow cooker around the beef.
  6. In a small bowl, whisk together the beef broth, red wine (if using), balsamic vinegar, Worcestershire sauce, and brown sugar.
  7. Pour the liquid mixture over the beef and vegetables. Top with fresh rosemary and thyme sprigs.
  8. Cover and cook on LOW for 8-9 hours (or HIGH for 4-5 hours) until the beef is fork-tender.
  9. Carefully remove the roast and herbs. Whisk the cornstarch slurry into the liquid in the pot.
  10. Cook on HIGH for an additional 10-15 minutes until the gravy is thick and glossy.
  11. Shred the beef slightly and serve topped with the jammy onions, mushrooms, and a generous ladle of gravy.