Slow Cooker French Onion Soup is so easy and super delicious. Lots of deep flavor from the caramelized onions.

Slow Cooker French Onion Soup is one of the easiest soups I’ve ever made. It’s very much a set it and forget it recipe.

Is French Onion Soup bad for you?

This soup is actually very nutritious. Onions are a part of the allium family. Onions like other vegetables in the allium family has quercetin. Quercetin is an antioxidant and an anti-inflammatory. According to Healthline.com it can reduce risks of heart disease, cancer, and degenerative brain disorders.

Onions also have allicin. Once an onion is cut it produces allicin. If you allow the onion to sit after cutting it for about 10 minutes before cooking it, you will get the most benefits from it. Allicin which is also found in garlic, may also lower blood sugar, cholesterol, and blood pressure. It also does what quercetin does.

What kind of onions is best for French Onion Soup?

Sweet onions will have the best flavor when caramelized. However you can also use yellow or white onions. The only onions I wouldn’t use are red. They tend to be a little more bitter.

Yield: 10 servings

Slow Cooker French Onion Soup

Name: Slow Cooker French Onion Soup
Prep time: 12 h
Cook time: 8 h
Total time: 20 h 10 min
Yield: 10
Ingredients: 1 baguette; 2 cups shredded gruyere cheese; 10 cups beef broth; 2 Tbsp balsamic vinegar; 3 lbs sweet onions; 2 Tbsp olive oil; 2 Tbsp unsalted butter; 2 tsp salt; 1 tsp black pepper

Slow Cooker French Onion Soup is so easy and super delicious. Lots of deep flavor from the caramelized onions.

Caramelizing the onions 12 hours

Cooking the Soup 8 hours

Additional Time 10 minutes

Total Time 20 hours 10 minutes

Ingredients

Caramelized Onions

3 lbs sweet onions
2 Tbsp olive oil
2 Tbsp unsalted butter
2 tsp salt
1 tsp black pepper

Soup

10 cups beef broth
2 Tbsp balsamic vinegar

To Serve

1 baguette
2 cups shredded gruyere cheese

Instructions

I normally start this the evening before I want to eat this soup.

Caramelizing the Onions

Turn 6 quart slow cooker on to low.
Slice onion in half and then slice with half moons. Allow to sit for 10 minutes to get the most health benefits.
While you are waiting on the onions, add butter to slow cooker. Allow to melt.
Add olive oil.
Place onions in slow cooker.
Sprinkle with salt and pepper. Using tongs mix the onions around to coat with butter and olive oil.
Place the lid on the slow cooker and cook for 12 hours.

Cooking the Soup

Add beef broth and balsamic vinegar. Mix gently.
Set to cook on low for 6-8 hours. The longer the better.
Dish soup into bowl. Top with slices of baguette and sprinkled with a generous amount of gruyere cheese. Place on sheet pan and place under broiler in oven.
Enjoy.

Slow Cooker French Onion Soup

Is French Onion Soup bad for you?

What kind of onions is best for French Onion Soup?

Slow Cooker French Onion Soup

Ingredients

Caramelized Onions

Soup

To Serve

Instructions

Caramelizing the Onions

Cooking the Soup

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Nutrition Information:

Yield:

Serving Size: