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Slow Cooker French Onion Soup Recipe

Slow Cooker French Onion Soup Recipe

5 Stars 4 Stars 3 Stars 2 Stars 1 Star 4.5 from 116 reviews
  • Author: Mia
  • Prep Time: 15 minutes
  • Cook Time: 12 hours
  • Total Time: 12 hours 15 minutes
  • Yield: 8 Servings 1x
  • Category: Soup
  • Method: Slow Cooker
  • Cuisine: French
  • Diet: Vegetarian

Description

Indulge in the rich, comforting flavors of Slow Cooker French Onion Soup. This classic soup is elevated with sweet caramelized onions, savory broths, and melted Gruyere cheese over toasted baguette slices. Perfect for a cozy night in or entertaining guests.


Ingredients

Units Scale

Onions:

  • 34 large sweet onions, organic, cut in half and sliced 1/8-1/4 inch thick

Seasoning:

  • 1/2 cup unsalted butter
  • 12 tablespoons coconut sugar (depending on onion sweetness)
  • 1/2 teaspoon salt
  • 3 cloves garlic, minced

Broths and Flavorings:

  • 4 cups chicken bone broth
  • 4 cups beef bone broth
  • 12 tablespoons Worcestershire sauce
  • Fresh thyme
  • 1 bay leaf
  • Salt and white pepper to taste
  • Fresh parsley

Accompaniments:

  • 1 loaf French Baguette, sliced into 1-inch thick slices
  • 23 cups Gruyere cheese, shredded

Instructions

  1. Melt Butter: In the crockpot, melt butter. Add onions, coconut sugar, salt, and garlic. Stir well.
  2. Cook Onions: Cook on low for 4-5 hours, stirring occasionally.
  3. Add Broths: Pour in chicken and beef broths, thyme, and bay leaf. Continue cooking on low for 8 hours.
  4. Season and Serve: Add Worcestershire sauce, salt, white pepper, and fresh herbs. Toast baguette slices, then ladle soup into bowls. Top with bread, cheese, and broil until melted. Serve hot.

Notes

  • Soup can cook for up to 12 hours on low.
  • Vegetable stock can substitute for chicken and beef broths.
  • For best flavor, cook onions during the day and let the soup simmer overnight.
  • Refrigerate soup for up to 3-4 days; reheat before serving.
  • Serving size may vary, recipe yields approximately 8 servings.

Nutrition

  • Serving Size: 1 bowl
  • Calories: Approximately 350 kcal
  • Sugar: Approximately 8g
  • Sodium: Approximately 800mg
  • Fat: Approximately 20g
  • Saturated Fat: Approximately 12g
  • Unsaturated Fat: Approximately 8g
  • Trans Fat: 0g
  • Carbohydrates: Approximately 25g
  • Fiber: Approximately 2g
  • Protein: Approximately 15g
  • Cholesterol: Approximately 50mg