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5 from 6 votes

Slow Cooker Best Ever French Onion Soup

Best French Onion Soup, Ever.
Prep Time10 mins
Servings: 10
Author: Star @ the skinny-ish dish


  • 2 large yellow sweet onions
  • 1/2 stick of butter
  • 1 tbs olive oil
  • 3 tbs all purpose flour
  • 2 tbs Worcestershire sauce
  • 3 cloves garlic , minced finely
  • 10 cups low sodium beef broth
  • salt & pepper


  • Baguette , Sliced thinly
  • Cheese , such as swiss, mozzarella, gruyere!


  • Halve and then cut onions into thin slices. In a large skillet over medium high heat add olive oil and butter. When the butter is melted add the onions. Cover and cook for about 8 minutes until the ovens are very soft. While the onions are cooking whisk together Worcestershire sauce and flour. Set aside. When the onions are done add to the slow cooker followed by minced garlic and the beef broth. Whisk in the flour and Worcestershire sauce. Salt and Pepper to taste. Cook on low for 7-8 hours.
  • When the soup is done. Preheat oven to 425 degrees. Ladle soup into a oven safe bowl. Top with a slice or two of toasted baguette and your choice of cheese. Place bowls onto a sturdy sheet pan and place in oven for 8-10 minutes until the cheese is melted and slightly golden brown.
  • Caution: Bowls will be very hot coming out of the oven. Take care to use a oven mitt and let cool slightly before handling.


Serving Size: 1 Cup Soup. 3 Smart Points, 2 Points Plus, 85 calories, 7g fat, 3g saturated fat, 5g carbohydrates, .5g fiber, 0g sugar, 1.5g protein.
Toppings: 1/2 oz sliced French baguette, 1 slice Baby Swiss Cheese. 4 Smart Points. 3 Points Plus. 130 calories 5g fat, 3.5g saturated fat, 11g carbohydrates, 0.5g fiber, 0g sugar, 7g protein,
*The points/calories will vary on exactly what type of toppings you use, but it should be about the same as long as you use the same amount.
This recipe can be easily halved. It makes a lot! I freeze half of it so that I have some ready to go when the french onion mood strikes.