Slow Cooker French Onion Soup.jpg

Slow Cooker French Onion Soup Recipe

This Slow Cooker French Onion Soup recipe is better than a restaurant’s and took me years to perfect. It is one of my husband’s favorite soups and it was never “just right” until now.

3.86 from 7 votes
Slow Cooker French Onion Soup.jpg
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Slow Cooker French Onion Soup Recipe

This Slow Cooker French Onion Soup recipe is better than a restaurant’s and one of my husband’s favorite soups.
Prep Time5 mins
Cook Time8 hrs
Total Time8 hrs 5 mins
Course: Soup
Cuisine: French
Servings: 8 Servings
Calories: 184kcal
Author: AndreAnna McLean


  • 3 large red onions sliced very thin
  • 3 large sweet white onions sliced very thin
  • 8 tablespoons unsalted butter refined coconut oil, or ghee
  • 1 tablespoon kosher or fine sea salt or more to taste
  • cup dry red cooking wine or sherry
  • 4 tablespoons Worcestershire sauce
  • 1 bay leaf
  • 1 teaspoon dried thyme or 1 tablespoon fresh
  • 7 cups gluten-free low-sodium beef stock


  • Put the onions in a slow cooker with the butter and salt. Cook on high for 6 hours, stirring occasionally.
  • Once the onions are caramelized, add the remaining ingredients to the slow cooker and cook on high for another 2-4 hours.
  • Alternatively, if you’re strapped for time, put the caramelized onions in a large soup pot and add the remaining ingredients. Bring to a boil, then simmer for 1 hour.
  • Note: If you’re not dairy-free, pour some soup in an oven-safe soup crock and cover with 1-2 slices of provolone cheese. Place under the broiler for a couple minutes until the cheese is bubbly and slightly brown on the edges.


Nutrition Facts
Slow Cooker French Onion Soup Recipe
Amount Per Serving
Calories 184 Calories from Fat 99
% Daily Value*
Fat 11g17%
Saturated Fat 7g35%
Cholesterol 30mg10%
Sodium 1377mg57%
Potassium 591mg17%
Carbohydrates 12g4%
Fiber 1g4%
Sugar 5g6%
Protein 5g10%
Vitamin A 355IU7%
Vitamin C 7.2mg9%
Calcium 52mg5%
Iron 1.4mg8%
* Percent Daily Values are based on a 2000 calorie diet.
Disclaimer: All nutrition facts on Gluten Free & More are meant only as a guide and may differ depending on product brands used or ingredient substitutions. Some errors may occur, so you are encouraged to confirm the recipe’s ingredient and nutrition suitability for your own diet.
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Tags: Beef Broth Broil Easy French Onion Soup Gluten-Free Gluten-Free Recipes Magazine Optionally Dairy Free Slow Cooker Wine
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