The Lazy Frech Onion Soup in the crockpot. The secret to big taste: cook your onions overnight!

A few months ago I did a few Instagram stories showing how I do my French Onion Soup in the crockpot and how it’s the easiest, and tastiest version ever. Well, people went crazy! I get so many requests for this recipe, and I’ve been terrible and getting it to you.  Talk about lazy!


Here it is, finally. I’ve tried so many different methods, and this one is hands down the laziest way to do it, but it packs major flavour.  I’ve tried traditional, instant pot and other methods too, and nothing holds a candle to this.

The secret to the taste: caramelizing the onions overnight! Yep! I put the onions in the crockpot overnight and let the slow cooker do it’s thing.

Hope you enjoy this as much as my family does! It’s a favourite around here.

Lazy Crockpot French Onion Soup

The secret is to let the onions cook overnight in the crockpot! No need to stand over the stove to caramelize the onions. 

Servings 8 servings


  • 6 onions thinly sliced
  • 2 tbsp butter
  • 2 tbsp olive oil
  • 2 cartons beef broth
  • salt and pepper
  • 1 tbsp dried thyme
  • 1/4 cup mozzarella cheese
  • 1/4 cup croutons


  1. Peel the skin from the onions and cut in half. Then use the food processor's slicing method to slice the onions. 

  2. Add onions to the crockpot with the butter and olive oil

  3. Set the crockpot on low for 12 hours overnight. I put it in the garage so the house doesn't smell like cooked onions while I'm sleeping 

  4. In the morning, add 2 cartons of beef broth and the seasoning

  5. Set for another 12 hours on low

  6. When you're ready to eat, ladle soup into french onion soup bowls and top with croutons and cheese

  7. Broil in oven until the cheese is bubbly and a bit brown

  8. Enjoy!

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