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The Best French Onion Soup

The Best Crockpot French Onion Soup

On a cold day, after a dog walk in the rain or snow, there’s nothing better than a hot bowl of soup! One of my faves is French Onion Soup, and there is no easier way to make this than in your crockpot/slow cooker!

The ingredients for this recipe will only set you back around $15 for a whole crockpot-full, so not only is this French Onion Soup easy to make, but it’s economical too! You’ll get several meals out of a single batch!

Shopping List for French Onion Soup

  • 3 lbs of onions
  • 2 tbsp melted butter
  • 1 tbsp granulated sugar
  • 8 cups good quality beef stock
  • 1 tsp salt
  • 1 tsp cracked black peppercorns
  • 2 tbsp cognac or brandy
  • 1 baguette
  • 2 cups shredded Swiss or Gruyere cheese (I find mozzarella works well too, but has a more mellow flavor.)

How to Make French Onion Soup

  1. Slice the onions and combine with melted butter in your slow cooker stoneware.
    Cook on HIGH for 2 hours.
    Preparing French Onion Soup
  2. Add the sugar to the onions and butter mixture and stir well to ensure sugar is evenly distributed and replace the lid.
  3. Place 4 layers of clean tea towels over the lid of the slow cooker to absorb any escaping moisture.
  4. Cook on HIGH for 4 hours, stirring a few times to ensure that the onions are browning evenly – replacing the towels each time.
    • NOTE: I find that sometimes 4 hours isn’t long enough to brown the onions, so I’ll add an additional hour to the cooking time if I think they need longer to caramelize.
  5. Stir in beef stock, salt, pepper, and brandy/cognac. Remove towels, cover and cook on HIGH for 2 hours.
    French Onion Soup - Caramelized Onions   French Onion Soup in the Crockpot
  6. When you’re ready to serve, preheat the oven broiler and slice your baguette.
    • NOTE: Rather than using slices, I like to cut my baguette into 1.5-inch cubes – this makes it easier to eat by eliminating the need to cut through the thick crust in your soup bowl.
  7. Ladle soup into oven-safe bowls.
  8. Place a layer of bread on top of the soup in each bowl and sprinkle liberally with cheese and broil until the cheese is melted, bubbly and browned (usually 2-3 minutes).
  9. Serve and ENJOY!

The Best French Onion Soup

For 21 Day Fixers:Mariska Eating French Onion Soup!

CONTAINER EQUIVALENTS per 1.5 cup serving:

  • 2 green
  • 1 yellow
  • 1/2 blue
  • 1/2 tsp



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