Overhead shot of homemade french onion soup

Crockpot French Onion Soup

A simple and what could be the easiest recipe for a classic comfort food. Minimal ingredients and minimal effort make this mama happy!
Course Soup
Cuisine French
Keyword crockpot french onion soup, french onion soup, slow cooker french onion soup
Prep Time 5 minutes
Cook Time 6 hours
Total Time 6 hours 5 minutes
Servings 10 cups
Calories 198kcal
Author Randa Derkson


  • 2 yellow onions chopped
  • 2 white onions chopped
  • 1 red onion chopped
  • 1 bay leaf
  • 6 cups water
  • 4 tbsps Better Than Boullion Beef Base I like lots, taste and adjust
  • 2 tsps  thyme
  • 12 Croutons or melba rounds or french bread
  • 3 cups mozzarella cheese
  • Optional: parmesan cheese


  • Add the 5 onions to the Crockpot, along with the water, bay leaf, boullion base and thyme. Cover and cook on high for 4-6 hours or low on 8-10 hours.
  • Preheat oven to broil.
  • Ladle the soup into french onion soup bowls and place on a baking sheet.
  • Top each bowl with a slice of a dried baguette (or croutons) and a handful of mozzarella cheese and optionional parmesan.
  • Broil until cheese is bubbly and brown.


Serving: 1g | Calories: 198kcal | Carbohydrates: 29g | Protein: 19.1g | Fat: 0.8g | Saturated Fat: 0.2g | Cholesterol: 6.1mg | Sodium: 886.4mg | Fiber: 2.6g | Sugar: 4.1g