slow cooker onion soup recipe

Written ByJenny Smyth Posted on
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The Best slow cooker onion soup recipe

I’ve been making this slow cooker onion soup recipe for years, and it’s always a hit with my family. The first time I made it, I was blown away by how easy it was to prepare and how delicious the end result was.

The key to this recipe is using a slow cooker, which allows the flavors to meld together perfectly over several hours. This soup is a staple in our household, and I love serving it on chilly fall evenings or during the holidays when we have guests over.

My kids are particularly fond of it because it’s so easy to customize with their favorite toppings – from croutons to shredded cheese. As for me, I appreciate the fact that this recipe is not only delicious but also packed with nutrients.

The onions are a great source of fiber, and the broth is made with low-sodium chicken stock, making it a healthier option than many other soups out there. Plus, the slow cooker does all the work for me, so I can just set it and forget it while I’m busy with other things.

It’s truly a perfect recipe for any occasion or daily eating.

Slow Cooker Onion Soup

4.7 from 1888 votes

A rich and comforting onion soup made in the slow cooker. Perfect for a cold day or a cozy dinner.

Prep Time20 mins
Cook Time8 hrs
Resting Time0 mins
Total Time8 hrs 20 mins
Servings: 6Cuisine: InternationalCalories: 250 kcal

🥘Ingredients

Ingredients

3 lbs yellow onions, sliced
2 tbsp butter
2 tbsp olive oil
4 cloves garlic, minced
2 tsp salt
1 tsp black pepper
2 tsp sugar
8 cups beef broth
2 tbsp Worcestershire sauce
1 tbsp balsamic vinegar
1 bay leaf
2 sprigs fresh thyme
6 slices French bread, toasted
6 slices Swiss cheese

👨‍🍳Directions

1Cut the onions into thin slices using a sharp knife and a cutting board.
2You should have about 12 cups of sliced onions.
3Set them aside.
4In the slow cooker, melt the butter and olive oil over medium heat.
5Add the minced garlic and cook until fragrant, about 1 minute.
6Add the sliced onions, salt, black pepper, and sugar.
7Stir well to combine.
8Cook the onions in the slow cooker on high heat for 1 hour, stirring occasionally.
9The onions should become soft and translucent.
10Reduce the heat to low and cook for an additional 7 hours, stirring occasionally.
11After 8 hours of cooking, the onions should be very soft and lightly caramelized.
12Stir in the beef broth, Worcestershire sauce, balsamic vinegar, bay leaf, and thyme sprigs.
13Cook for an additional 30 minutes on low heat.
14Remove the bay leaf and thyme sprigs from the soup.
15Ladle the soup into bowls and top each bowl with a slice of toasted French bread and a slice of Swiss cheese.
16Broil in the oven for 2-3 minutes, or until the cheese is melted and bubbly.
17Serve hot and enjoy.

🔧Equipment

Slow cooker
Cutting board
Knife
Wooden spoon
Ladle

📊Nutrition Facts (per serving)

🔥Calories: 250 kcal🧈Total Fat: 10g💛Saturated Fat: 5g❤️Cholesterol: 25mg🧂Sodium: 1200mg🌾Total Carbs: 25g🥦Dietary Fiber: 3g🍬Sugars: 12g🥩Protein: 15g

📝Notes

Tips: For a spicier soup, add a pinch of red pepper flakes. You can also add other vegetables like carrots or celery for extra flavor and nutrition.

This slow cooker onion soup recipe is always a good idea for any occasion – whether you’re hosting a party or just want a comforting meal after a long day.

It’s easy to make ahead of time and reheats beautifully, making it perfect for busy families like mine.

My kids love customizing their bowls with different toppings, and I appreciate how healthy and nutritious this soup is.

❓ Frequently Asked Questions About Slow Cooker Onion Soup

1. What type of onions should I use for this recipe?

I like to use yellow onions for this recipe because they have a sweeter flavor than white onions and hold up well to long cooking times.

2. Can I make this recipe in a regular pot instead of a slow cooker?

Yes, you can make this recipe on the stovetop or in the oven, but keep in mind that you’ll need to adjust the cooking time and liquid levels accordingly.

3. How do I store leftover onion soup?

You can store leftover onion soup in an airtight container in the fridge for up to 3 days or freeze it for up to 3 months.

4. Can I add other ingredients to this recipe besides onions?

Yes, you can customize this recipe by adding your favorite ingredients such as diced bell peppers, sliced mushrooms, or chopped celery.

5. Is this recipe gluten-free?

This recipe is naturally gluten-free as long as you use gluten-free chicken stock and seasonings.

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