Slow Cooker French Onion Soup – Budget-Friendly, Restaurant-Style Comfort

French onion soup is something I look forward to every year. It’s one of those dishes that feels like a special occasion—and it really is! There’s nothing better than a warm bowl of caramelized onions in rich beef broth topped with gooey cheese and crusty bread. My kids? They just love dipping the bread—but hey, whatever floats your boat!

If you haven’t tried making this restaurant classic at home, I highly recommend it. Not only is it easy, it’s surprisingly inexpensive—a great way to save a few bucks on dinner this week. Plus, it’s included in my Budget Meal Plan Library, which gives you weekly dinners for around $50. You can check it out for a free 7-day trial here and see how you could save $5,200 this year compared to the average family grocery budget. Think of all the things you could do with that extra money!

This recipe is inspired by Spend with Pennies, and I’ve made a few tweaks for flavor and budget-friendliness: I swap brown sugar for coconut sugar (but leave brown sugar optional), use homemade sliced sourdough left out to make it crusty, and stick to sliced Gruyere and freshly grated aged Parmesan. Top with crushed red pepper if you like a little heat, and I always use dried thyme instead of fresh for convenience.

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Ingredients – Slow Cooker French Onion Soup

• 3 large white onions, sliced
• 3 tablespoons butter
• 2 tablespoons coconut sugar (or brown sugar, optional)
• 64 ounces beef broth (reduced sodium preferred)
• 1 tablespoon Worcestershire sauce
• 1 clove garlic, minced
• ⅓ cup dry sherry
• 1 teaspoon dried thyme
• 1 bay leaf
• 6 slices sourdough bread (I slice and leave mine out on the counter for the day)
• ¾ cup sliced Gruyere cheese
• 6 tablespoons freshly grated Parmesan cheese
• Optional: crushed red pepper for topping

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Instructions

1. In a large non-stick pan, cook the onions, butter, and coconut sugar over medium-low heat until golden and caramelized, about 20 minutes.
2. Once caramelized, transfer the onions to your slow cooker. Add beef broth, Worcestershire sauce, garlic, dry sherry, dried thyme, and bay leaf.
3. Cook on low for 6–8 hours.
4. Remove the bay leaf, ladle soup into oven-safe bowls, and top each with a slice of stale bread.
5. Layer on Gruyere and Parmesan cheeses. Broil for 2–3 minutes until the cheese is melted and browned.
6. Sprinkle with crushed red pepper if desired, and serve warm.

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Tips for the Best Slow Cooker French Onion Soup

• Onions: Slice evenly to ensure consistent caramelization.
• Bread: Stale or slightly dried bread works best—it soaks up the soup without turning mushy.
• Cheese: Only use Gruyere and freshly grated Parmesan for the authentic flavor.
• Make Ahead: You can caramelize the onions ahead of time and store them in the fridge until ready to use.

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Why You’ll Love This Recipe

• Budget-friendly: restaurant-style soup without the cost
• Easy: set it in the slow cooker and let it do the work
• Family-friendly: kids love dipping bread, adults love gooey cheese
• Flexible: swap cheeses or add a little heat with crushed red pepper

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