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Slow Cooker Vegetarian French Onion Soup

Updated on May 4, 2014
5 stars from 1 rating of Slow Cooker Vegetarian French Onion Soup

A vegetarian twist on a meat-eaters favorite classic soup. Of course, where I call for vegetable broth, feel free to swap out for beef broth instead if you need your fix.

Cook Time

Prep time: 30 min
Cook time: 7 min
Ready in: 37 min
Yields: 4 - 6 servings


  • 4 Sweet Onion, Peeled, sliced
  • 2 Tablespoons Butter
  • 1 Tablespoon Worcestershire Sauce, I have left this is out in the past and still enjoyed the soup.
  • 1 Tablespoon Balsamic Vinegar
  • 3 Cloves Garlic, Minced
  • 1/2 Teaspoon Pepper
  • 1/2 Teaspoon Salt
  • 3 Tablespoons Flour
  • 64 oz Vegetable Broth, (Swap for beef broth if you prefer meat)
  • 2 Tablespoons Thyme
  • 4 Slices French Bread, 1 slice per serving
  • 4 Slices Swiss, Gouda, Provolone, or Mozzarella, 1 slice per serving, pick cheese based on preference. In this one, I am using Provolone
  1. Set crock pot to high and add all the onions (sliced), butter, Worcestershire sauce, Balsamic Vinegar, garlic, salt and pepper.
  2. Cook this for 60 minutes, stirring from time to time.
  3. Add all the flour, and stir in. Let sit, cooking on high, for another 5 minutes.
  4. Add all vegetable broth and thyme. Change setting to low and cook for another 6-8 hours. ***If you are too short on time, do steps 1 and 2, then add everything (onions mix and broth) to a large enough saucepan. Cook for another hour on low-medium heat.
  5. Ladle soup serving into an oven safe bowl. Add slice of bread on top and one slice of cheese over that.
  6. Broil for 3 minutes and serve!

Based on soup only. Add calories for cheese and bread based on your personal selections.

Nutrition Facts
Serving size: 1 Cup
Calories 74
Calories from Fat0
* The Percent Daily Values are based on a 2,000 calorie diet, so your values may change depending on your calorie needs. The values here may not be 100% accurate because the recipes have not been professionally evaluated nor have they been evaluated by the U.S. FDA.


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