Slow Cooker French Onion Roast – Tender, Savory Comfort Food
A tender, slow-cooked beef roast simmered with caramelized onions, garlic, thyme, and a savory broth inspired by French onion soup. Perfect for a hearty dinner with minimal effort.
- Prep Time: 20 minutes
- Cook Time: 8 hours
- Total Time: 8 hours 20 minutes
- Yield: 6 servings 1x
Ingredients
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3–4 lb chuck roast
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3–4 large yellow onions, thinly sliced
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4 cloves garlic, minced
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2 cups low-sodium beef broth
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2 tbsp Worcestershire sauce
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1 tbsp balsamic vinegar
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1 tbsp Dijon mustard
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1 tsp dried thyme (or 2 tsp fresh)
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1 bay leaf
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Salt and pepper, to taste
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1 tbsp oil (for searing)
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Optional: 1 tbsp cornstarch + 2 tbsp water (for thickening)
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Optional: Gruyère or Swiss cheese for serving
Instructions
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Caramelize onions in a skillet over medium heat for 15–20 minutes until golden and soft. Set aside.
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Season roast with salt and pepper. Sear in hot oil on all sides until browned.
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In slow cooker, layer caramelized onions, then roast. Add garlic, broth, Worcestershire, balsamic, mustard, thyme, and bay leaf.
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Cover and cook on low for 8–9 hours or high for 5–6 hours, until beef is fork-tender.
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Optional: Remove beef and stir in cornstarch slurry. Cook on high for 15–20 minutes to thicken.
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Serve shredded or sliced with onions and sauce. Top with cheese if desired.
Notes
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Add mushrooms or root vegetables during last few hours for a complete meal.
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Freeze leftovers for up to 3 months.
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Serve with mashed potatoes or crusty bread.