French Onion Soup..Slow Cooker


3 pounds onions, which is around 6 large onions …I weigh

1/2 cup (4 oz) butter, melted

2 cloves garlic, minced

1/2 cup dry sherry wine …I didn’t have any the first time I made this…I do now

8 cups beef stock/broth

1 bay leaf

1/4 tsp dry thyme (or 3 sprigs fresh)…I don’t especially like thyme, so I omitted
salt and pepper to taste …my broth is salted, so I add no salt

Baguette, sliced …I did use baguette …but might the next time, use French bread. (I find a baguette too holey)

8 oz of Gruyere cheese, shredded, divided (check recipes if you wish to use Gruyere and combine with another cheese or two …I used just Gruyere


Step 1:

Cut onions in half, and slice thinly.

Place them in the slow cooker.

Add your melted butter and stir well so all onions are coated.

Put this on low overnight, 10 – 12 hours.

Step 2:

Add the garlic.

Stir sherry into onion mixture; scrape the bottom to dissolve the small bits of browned food.

Step 3:

Throw in the thyme, bay leaf, salt/pepper and broth.

Stir well.

Cook on low for 8 – 10 hours or on High for 4 – 6 hours.

I did a combo of that …when I needed it to be ready, I went with it. After all the onions are cooked …the rest is just melding.

Step 4:

Preheat oven to 400ºF.

Slice bread to 1/2″ thick slices.

Brush both sides lightly with olive oil.

Arrange on a baking sheet and bake 6 – 8 minutes until golden brown at the edges.

I did about 8 minutes …flipped the bread and did another 2 minutes.

Step 5:

Once soup is out, set oven to ‘broil’.

Step 6:

Pour soup into bowls..3/4 full or so.

Sprinkle the top with a bit of your cheese.

Lay the bread on top …and sprinkle the rest of the cheese on top.

Broil for 2-3 minutes …until cheese topping is lightly browned and bubbling.

NOTE: This made 6 bowls for me.

Nutrition Information:

Calories: 350 kcal | Total Fat: 20g | Saturated Fat: 10g | Cholesterol: 40mg | Sodium: 900mg | Total Carbohydrates: 30g | Dietary Fiber: 3 | Sugars: 8g | Protein: 10g

Frequently Asked Questions:

Can I use a different type of cheese instead of Gruyere for this French Onion Soup recipe?

Yes, you can use a different type of cheese if you prefer.

Gruyere is traditionally used in French Onion Soup for its nutty flavor and melting properties, but you can experiment with other cheeses like Swiss, Emmental, or even mozzarella.

Can I omit the dry thyme from the recipe if I don’t like it?

Absolutely! The dry thyme adds a subtle herbaceous flavor to the soup, but if you don’t enjoy it, feel free to omit it.

You can still enjoy a delicious French Onion Soup without it.

Can I make this soup without using a slow cooker?

Yes, you can adapt this recipe for stovetop cooking.

Simply sauté the onions and garlic in a large pot until caramelized, then add the remaining ingredients and simmer for about an hour.

The flavors will still meld beautifully.

Can I substitute dry sherry wine with another type of alcohol or omit it altogether?

While dry sherry wine adds depth of flavor to the soup, you can substitute it with a dry white wine or omit it altogether if you prefer.

The soup will still be delicious without it, but the sherry does add a unique touch.

How do I prevent the bread from becoming soggy when serving the soup?

To prevent the bread from becoming soggy, it’s best to toast it lightly before adding it to the soup.

This step helps the bread hold its texture and absorb less liquid from the soup.

Additionally, placing the bread on top of the soup just before serving helps maintain its crispness until it’s enjoyed.

Can I prepare the onions and store them overnight before cooking the soup?

Yes, you can prepare the onions ahead of time and store them in an airtight container in the refrigerator overnight.

This can save you time when you’re ready to cook the soup the next day.

Can I freeze leftover French Onion Soup?

Yes, French Onion Soup freezes well.

Allow the soup to cool completely before transferring it to freezer-safe containers.

Leave some space at the top of the container to allow for expansion during freezing.

Thaw overnight in the refrigerator before reheating.

How long does French Onion Soup last in the refrigerator?

When stored in an airtight container, French Onion Soup can last in the refrigerator for up to 3-4 days.

Reheat it on the stovetop or in the microwave until warmed through before serving.

Can I use vegetable broth instead of beef broth for a vegetarian version of this soup?

Yes, you can substitute vegetable broth for beef broth to make a vegetarian version of this French Onion Soup.

The flavor profile will be slightly different, but it will still be delicious.

Can I use pre-made croutons instead of toasted bread for the topping?

While toasted bread is traditional for French Onion Soup, you can certainly use pre-made croutons if you prefer.

Just be sure they are sturdy enough to hold up in the soup and provide a satisfying crunch.

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