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French onion soup topped with melted cheese, fresh herbs, and toasted baguette slices in a slow cooker.

Slow Cooker French Onion Pot Roast

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This French onion pot roast simmers all day in a rich, from-scratch onion gravy, then gets finished with melted Gruyère and fresh parsley. It's a slow cooker French onion pot roast that tastes like a Sunday dinner with very little hands-on work.
Prep Time 35 minutes
Cook Time 8 hours
Total Time 8 hours 35 minutes
Servings 6 5 ounces beef with onions and gravy
Calories 592
Author Gina Dickson

Equipment

  • 6-quart slow cooker
  • Large skillet
  • Cutting board

Ingredients

  • 3 pounds chuck roast
  • 1 ½ teaspoons kosher salt
  • 1 teaspoon black pepper
  • 2 tablespoons olive oil
  • 4 yellow onions large, thinly sliced
  • 2 teaspoons garlic fresh, minced
  • 2 tablespoons all-purpose flour
  • 2 cups beef broth carton
  • 1 tablespoon Worcestershire sauce
  • 1 tablespoon balsamic vinegar
  • 1 teaspoon Dijon mustard
  • 1 teaspoon dried thyme
  • 1 fresh rosemary sprig about 3 inches, stem removed (leaves whole or chopped)
  • 1 bay leaf
  • 1 cup Gruyère cheese shredded
  • 2 tablespoons parsley fresh, chopped, optional
  • 6 slices crusty bread (dry crusty bread slices, optional)

Instructions

Season the Beef

  • Pat the chuck roast dry on all sides with paper towels. A dry surface browns better.
    3 pounds chuck roast
  • Sprinkle the salt and pepper over the roast, making sure to cover every side.
    1 ½ teaspoons kosher salt, 1 teaspoon black pepper

Sear the Roast

  • Set a large skillet over medium-high heat and add the olive oil.
    2 tablespoons olive oil
  • Once the oil is hot and shimmering, add the roast. Let it sit without moving until a deep brown crust forms on the bottom.
    A raw steak seasoned with salt and pepper in a black cast iron skillet.
  • Turn the roast and brown the remaining sides the same way. You aren't cooking it through here, just giving it extra flavor before it goes into the slow cooker.
  • Move the browned roast to the slow cooker.
    A seared piece of meat in a white oval ceramic dish.

Cook the Onions

  • Add the sliced onions to the same skillet. They may look like a ridiculous amount at first, but don't worry, they cook down quite a bit.
    4 yellow onions
    Sliced white onions in a cast-iron skillet.
  • Cook for 8 to 10 minutes, stirring occasionally, until the onions soften and pick up the browned bits from the bottom of the skillet.
  • Add the garlic and cook for 1 more minute, just until you can smell it.
    2 teaspoons garlic

Make the Onion Gravy

  • Sprinkle the flour over the onions and stir until it disappears into the onions.
    2 tablespoons all-purpose flour
    Sautéed sliced onions dusted with flour in a black cast iron skillet.
  • Cook for about 1 minute so the flour doesn't taste raw.
  • Slowly pour in the beef broth, stirring as you go and scraping up any browned bits stuck to the skillet. This is where all that good flavor is hiding.
    2 cups beef broth
  • Stir in the Worcestershire sauce, balsamic vinegar, Dijon mustard, thyme, rosemary, and bay leaf.
    1 tablespoon Worcestershire sauce, 1 tablespoon balsamic vinegar, 1 teaspoon Dijon mustard, 1 teaspoon dried thyme, 1 fresh rosemary sprig, 1 bay leaf
    Cast iron skillet containing onion gravy garnished with rosemary sprigs, a bay leaf, and a dollop of coarse mustard.

Slow Cook the Roast

  • Pour the onion mixture over the roast in the slow cooker.
    A slow cooker containing a seared piece of meat topped with sautéed onions and herbs in a brown sauce.
  • Cover and cook on LOW for 8 hours. The beef is ready when it's fork-tender and pulls apart easily with a fork. If it resists, give it more time.

Add the French Onion Finish

  • Carefully move the roast to a cutting board and let it rest for 10 minutes.
    Pieces of cooked, braised meat with caramelized onions on a wooden cutting board.
  • Remove the bay leaf from the slow cooker and discard it.
  • For thicker gravy (optional), set the slow cooker to HIGH while the roast rests. Let the liquid cook uncovered for 15 to 20 minutes, stirring occasionally.
  • Shred the beef with two forks, or slice it.
  • Return the beef to the slow cooker and spoon plenty of the onions and gravy over the top.
  • Sprinkle the Gruyère over the beef. Cover and let it sit for a few minutes, just until the cheese melts.
    1 cup Gruyère cheese
  • Finish with the parsley and tuck in a few pieces of crusty bread. Serve while everything is hot.
    2 tablespoons parsley, 6 slices crusty bread
    A white slow cooker filled with shredded beef in brown gravy, topped with melted cheese and fresh herbs.

Notes

Slow Cooker Times
  • LOW: 8 hours (recommended for the most tender meat and best flavor)
  • HIGH: 4 to 5 hours
Make Ahead
  • The night before, slice the onions and store them in a tightly sealed bag in the refrigerator so the smell doesn't spread.
  • Mince the garlic and store it in a small airtight container in the refrigerator.
  • Measure the broth into one container, and the Worcestershire sauce, balsamic vinegar, Dijon mustard, thyme, rosemary, and bay leaf into another.
  • Sear the roast and make the gravy the morning you cook. The gravy depends on the browned bits from searing.
Substitutions
  • Shoulder roast in place of chuck roast
  • Swiss cheese in place of Gruyère
  • White onions (sharper flavor) or Vidalia onions (sweeter, more mellow) in place of yellow onions
Variations
  • Add 8 ounces of sliced white button mushrooms or baby bellas when you cook the onions.
  • Pile sliced leftovers onto toasted French bread with onions and cheese, and serve the gravy on the side for dipping.
Storage
  • Store leftovers in an airtight container in the refrigerator for 3 to 4 days.
Freezing
  • Freeze leftovers in a freezer container for up to 3 months.
  • Thaw in the refrigerator overnight before reheating (best option), or use the defrost setting on your microwave and reheat it right away.
Reheating
  • Oven: Place the leftovers in a casserole dish with a splash of beef broth. Cover and heat at 325 degrees Fahrenheit for 15 minutes, or until heated through to 165 degrees Fahrenheit in the center.
  • Microwave: Cover and heat in 30-second bursts, stirring between bursts, until heated through to 165 degrees Fahrenheit.

Nutrition

Serving: 1serving | Calories: 592kcal | Carbohydrates: 11g | Protein: 52g | Fat: 38g | Saturated Fat: 16g | Polyunsaturated Fat: 3g | Monounsaturated Fat: 19g | Trans Fat: 2g | Cholesterol: 181mg | Sodium: 1270mg | Potassium: 962mg | Fiber: 2g | Sugar: 4g | Vitamin A: 256IU | Vitamin C: 6mg | Calcium: 295mg | Iron: 6mg
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