Slow Cooker French Onion Soup

Name: The Best Slow Cooker French Onion Soup
Prep time: 15 min
Cook time: 9 h
Total time: 555 min
Yield: 2
Ingredients: 4 large onions sliced; 30 g (~ 2 tbsp) butter, roughly chopped; 1 tbsp caster sugar; 1 tbsp balsamic vinegar; 2 tsp minced garlic or garlic puree; 1 tsp dried thyme; 1 tsp black pepper; 750 ml (~ 3 cups) vegetable stock; 2-4 thick slices French baguette; 2-4 tbsp grated cheese (I used cheddar)

by Becca

2 people

9 hr 15 min

Let your appliance do all the hard work to make this spectacular slow cooker French onion soup! It’s rich and flavourful, and topped with a giant cheesy crouton.

best slow cooker french onion soup recipe

If you like it when your dinner cooks itself, you’ll love this slow cooker French onion soup. It’s rich and earthy, sweet and tangy, and all-round wonderful. Add a super cheesy crouton, and you may as well just marry it now.

Slow cooker soup

I’m so excited to get my slow cooker out of the cupboard, now that the weather’s cooling off. There’s nothing better than an appliance that takes a job off my hands (notable mention to my other best buddy, the dishwasher).

A slow cooker is the perfect low effort appliance. Just chuck in a few raw ingredients (which in this case literally took me about 8 minutes), leave it to cook throughout the day, and dinner’s made itself. Hurrah!

Soup is the perfect thing to make in a slow cooker, as whatever you add has plenty of time to cook down beautifully, intensifying the flavours. Often, the amount of time you cook soup for isn’t hugely important, so if you’re not quite ready to eat when the soup’s ready, it probably won’t mind simmering away for another hour or two, until you’re hungry.

Slow Cooker French Onion Soup

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Recipe details

Yield 2 people
Time spent: Prep time: 15 Minutes Cook time: 9 Hours Total time: 9 hr 15 min

Show Nutrition Info

Per serving

% Daily value

Ingredients

For the slow cooker French onion soup:

4 large onions sliced
30 g (~ 2 tbsp) butter, roughly chopped
1 tbsp caster sugar
1 tbsp balsamic vinegar
2 tsp minced garlic or garlic puree
1 tsp dried thyme
1 tsp black pepper
750 ml (~ 3 cups) vegetable stock

For the cheesy crouton:

2-4 thick slices French baguette
2-4 tbsp grated cheese (I used cheddar)

Instructions

Add all of the soup ingredients to a slow cooker, and mix well to break up the onions. Cook on high for approximately 9 hours, or until the onions are a deep, rich brown colour, and very soft.
Serve on its own, or with a cheesy crouton. To make the cheesy crouton, dish up a bowlful of soup into a heat-safe bowl, and top with 1 or 2 thick slices of French baguette. Sprinkle over plenty of grated cheese, then place under a grill (broiler) for a few minutes, until the cheese is melted and slightly crispy. Serve immediately.

Comments

Julia on Nov 12, 2021

9 hours on high?

36 Reply
- See 2 previous
- Connie Hardman on Nov 12, 2021
  
  That’s what I was thinking too! Lol
  
  10
- Jenni on Nov 13, 2021
  
  Oh my. I don’t think so. You’d have no soup left lol. I’m going low lol
  
  4
- Kristine McGill-Arneson on Nov 15, 2021
  
  I did mine on high and it came out just fine. I added a bit more stock as I had way to many onions but had plenty of broth in the end.
  
  4
Eve on Nov 12, 2021

Seriously…..high?

20 Reply