Combining the rich, deeply savory flavors of classic French onion soup with tender meatballs and hearty potatoes creates the ultimate comforting, all-in-one slow cooker meal. The slow cooking process allows the potatoes to soak up the rich beef and onion broth while the meatballs become melt-in-your-mouth tender.
1. Essential Ingredients
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The Meatballs: 1.5 to 2 lbs of frozen or homemade beef/italian meatballs (uncooked or fully cooked work—just adjust cooking time accordingly).
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The Potatoes: 4 medium Yukon Gold or Russet potatoes, peeled and cut into bite-sized chunks or thick wedges.
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The Onions: 2 large yellow onions, sliced thinly into half-moons.
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The Broth & Flavor Base:
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2 cups low-sodium beef broth
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1 packet (1 oz) onion soup mix or 2 tablespoons beef bouillon paste
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1 tablespoon Worcestershire sauce
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2 tablespoons butter (for rich flavor)
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1 teaspoon dried thyme, salt, and freshly cracked black pepper
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The Finishing Touch (Optional): 1.5 cups shredded Gruyère or Swiss cheese for melting on top right before serving.
2. Step-by-Step Instructions
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Build the Bed of Onions & Potatoes: Place the sliced yellow onions and potato chunks at the bottom of your slow cooker.
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Add the Meatballs: Arrange the meatballs right on top of the potatoes and onions.
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Pour the Rich Broth: In a measuring cup, whisk together the beef broth, onion soup mix, Worcestershire sauce, thyme, and black pepper. Pour the mixture evenly over the meatballs and potatoes. Drop the 2 tablespoons of butter right on top.
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Cook Low and Slow: Cover and cook on LOW for 6 to 7 hours (or HIGH for 3 to 4 hours) until the potatoes are fork-tender and the onions have melted down into a rich gravy.
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Melt the Cheese (Optional): If you want that classic French onion soup feel, sprinkle shredded Gruyère or Swiss cheese over the top during the last 15 minutes of cooking, cover until melted and bubbly, and serve warm!
