Slow Cooker French Onion Soup (Gluten-Free)

This gluten-free and healthy Slow Cooker French Onion Soup is comfort food at it’s finest. It’s made using simple ingredients you likely already have in your pantry, is largely hands-off cooking, is an economical meal and is so rich and flavorful. It can be eaten as is as a light soup, or more traditionally topped with melted cheese and either store-bought or homemade bread.

Slow Cooker French Onion SoupSlow Cooker French Onion Soup

French Onion Soup is such a classic comfort food, it’s hard not to love. If you’ve only eaten it at restaurants you might think it’s difficult to make because it’s SO rich and flavorful, but truly it isn’t that hard at all! And we’ve made it even easier by throwing the whole thing in the slow cooker for easy, hands-off cooking! This Slow Cooker French Onion Soup is a great example of taking really basic pantry items like onions, broth and a few other simple ingredients and turning it into something amazing by slow and low cooking. Recipes using pantry staples are a great to have in your back pocket on days when you don’t have time to run to the grocery store but still want to be able to cook up a great meal for your family.

Crock Pot French Onion Soup

What is French Onion Soup Made Of

Traditionally French onion soup is made by slowly caramelizing onions on the stove top, which can require lots of babysitting and stirring to make sure the onions don’t burn. The onions are then coated in flour and simmered for longer with broth. This Slow Cooker French Onion Soup recipe however takes all the amazing flavors of this bistro classic and tosses them all in the slow cooker to make while you are busy doing other things! The first step is to cook all the onions for about 6 hours, which doesn’t require any stirring. This step can have some wiggle room if you are about and about because it’s hard to burn onions in the slow cooker, so if you aren’t home during the end of the 6 hours of cook time, the onions will likely be fine for 2-3 hours after. Next you simmer the onions in the broth for the remainder 2 hours of cooking time. Classic French onion soup is topped with a large crouton-like piece of bread and cheese. We’ve given directions on how to do this, but truly you can leave this off and this soup is still really flavorful!

What is the best onion to use for French onion soup

This Slow Cooker French Onion Soup recipes uses two kinds of onions. Yellow onion are more sweet with a really bright flavor and red onions have more depth with a touch of bitterness. Together they make a really nuanced and flavorful french onion soup!

Healthy Slow Cooker French Onion Soup

Can you cook French Onion Soup in the Instant Pot?

The short answer is: yes! We’ve included the directions for cooking this soup in the Instant Pot in the notes section of this recipe. However we have to say that it is a little bit more hands on cooking than the slow cooker version.

If you like this slow cooker SOUP recipe, try these other favorites:

Want to try other crock pot comfort food favorites? Try these:

Watch the video:


Slow Cooker French Onion Soup
Serves 8
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Prep Time
15 min
Cook Time
8 hr
Prep Time
15 min
Cook Time
8 hr
Ingredients
  1. 3 tablespoons grass-fed butter
  2. 1 tablespoon extra-virgin olive oil or avocado oil
  3. 4 white onions, sliced
  4. 2 red onions, sliced
  5. 1 tablespoon coconut sugar
  6. 3 cloves of garlic, minced
  7. 1/4 cup balsamic vinegar
  8. 2 teaspoons dried thyme or 2 fresh thyme sprigs
  9. 2 bay leaves
  10. 1 teaspoon salt, more to taste
  11. 1 teaspoon black pepper, more to taste
  12. 7 cups beef broth
  13. 1/2 teaspoon fish sauce
  14. 1 tablespoon arrowroot flour
  15. Optional: chili flakes
  16. Options: 1/4 cup shredded Gruyere cheese
  17. Optional: 1/4 cup shredded mozzarella cheese
  18. Optional: 1 batch bread (see recipe here)
Instructions
  1. Place butter and oil in the bottom of your slow cooker insert.
  2. Add in sliced onions, coconut sugar, garlic, balsamic vinegar, half the salt and pepper, thyme and bay leaves. Toss to coat and cook on low for 6 hours.
  3. After 6 hours, add in beef broth, fish sauce, arrowroot flour, and the remaining salt and pepper.
  4. Let cook for the remaining 2 hours. Remove bay leaves and thyme sprigs if using fresh thyme. Taste and add salt and pepper as desired.
  5. Heat the oven to 350°F. Divide the soup between oven-safe bowls. Top each with a slice (or two) of toasted bread and sprinkle cheese in a thick layer over the bread and up to the edge of the bowl. Bake for 20 to 30 minutes until cheese is bubbling. Broil on high for 1 minute.
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