Slow Cooker French Onion Soup – Rich, Flavorful & Extra Cheesy!

If you love rich, caramelized flavors and melty cheese, this Slow Cooker French Onion Soup is a must-try! It’s ridiculously easy to make, and the slow cooker does all the work, giving you deep, savory flavors without standing over the stove.

This classic French soup features slow-cooked onions in a rich beef broth, topped with crispy toasted bread and gooey melted cheese. And the best part? You can add as much cheese as you want—because cheese = happiness!

Not only is this soup comforting and delicious, but it’s also budget-friendly, making it a great choice for cozy dinners without breaking the bank. Let’s make the best Slow Cooker French Onion Soup ever!

INSTRUCTIONS:

1 ) Add the thinly sliced onions to a 6-qt slow cooker. Stir in butter, brown sugar, 1 teaspoon salt, sherry vinegar and Worcestershire sauce.

2 ) Cover and cook on high heat for 8-9 hours or on low for about 12-14; or until onions are caramelized and browned. Make sure to stir halfway, as needed, to prevent burning.

3 ) Stir in beef stock, season with salt and pepper, to taste and add thyme sprigs and bay leaves. Cover and cook on high heat for 2-3 hours or on low for 4-5 hours. When ready discard thyme and bay leaves.

4 ) Preheat oven to broil.

5 ) Place baguette slices onto a baking sheet and broil until golden brown on both sides, about 1-2 minutes per side.

6 ) Divide soup into ovenproof bowls, place the bowls on a baking sheet. Top with toasted baguette slices, about two slices per bowl, the bread should cover the soup; top with lots of shredded cheese.

7 ) Place into the oven and broil until the cheese is bubbly and golden brown, about 2 minutes.
Serve immediately.

 

Pro Tips for the Best Slow Cooker French Onion Soup

• Caramelize the Onions Properly – Let the onions cook low and slow for the best deep, sweet, and rich flavor.
• Use Good-Quality Cheese – Gruyère is classic, but Swiss, mozzarella, or provolone also work beautifully.
• Toast the Bread Before Topping – This keeps it from getting too soggy and gives the soup its signature crunch.
• Deglaze for Extra Flavor – A splash of white wine or sherry enhances the depth of flavor.
• Use Beef Broth for a Rich Base – A high-quality beef broth or stock creates the most authentic taste.
• Top with Extra Cheese – Melt under the broiler for a golden, bubbly cheese topping!

(FAQ) About Slow Cooker French Onion Soup

1. What kind of onions should I use?

• Yellow onions are the best for rich, sweet flavor, but you can also use Vidalia or red onions for a twist.

2. Can I make this soup vegetarian?

• Yes! Swap the beef broth for vegetable broth and use plant-based butter.

3. What’s the best cheese for French Onion Soup?

• Gruyère is the classic choice, but Swiss, provolone, or even cheddar work well.

4. Can I use store-bought croutons instead of bread slices?

• Yes! Store-bought croutons make this soup even easier to prepare.

5. How long does French Onion Soup last in the fridge?

• Store in an airtight container in the fridge for up to 4 days.

6. Can I freeze French Onion Soup?

• Yes! Freeze without the bread and cheese, then reheat and add toppings when serving.

7. Can I add meat to this soup?

• For a heartier version, add shredded beef, grilled chicken, or even crispy bacon.

8. What’s the best wine to use in French Onion Soup?

• Dry white wine or sherry works best to deglaze the onions and add depth.

9. Can I make this on the stovetop instead of a slow cooker?

• Yes! Caramelize onions in a large pot, add broth, and simmer for about 30 minutes before serving.

10. What should I serve with French Onion Soup?

• Pair with a simple salad, roasted vegetables, or a crusty baguette for a complete meal.

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Adapted from: Source