Air Fryer French Onion Soup

Air fryer french onion soup isn’t a gimmick, I promise. Instead, this recipe uses science to take a 2 hour dish into a 60 minute one. By dehydrating the onions slightly in the air fryer, the onions caramelize much quicker and deeper in the pan. The result is a wonderfully complex soup that is as comforting as they come (and truly not that terrible for you). Air fryer french onion soup will become one of your favorite soup recipes, I assure you!

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5 from 3 votes

Air Fryer French Onion Soup

Science is tasty
Course Appetizer
Cuisine French
Prep Time 5 minutes
Cook Time 1 hour
Servings 4
Author Jim


  • 3 tablespoons butter
  • 6 cups sliced onions (thats about 6 onions)
  • 2 teaspoons fresh thyme
  • 1 teaspoon soy sauce
  • 1/2 teaspoon salt
  • 1 bay leaf
  • 6 cups low sodium beef stock
  • 4 thick slices sourdough
  • 2 cups shredded Provolone cheese


  • Set your air fryer to 300 degrees. Line the basket with foil if you like, and cook sliced onions for 30 minutes to dry out. Stir often.
  • Heat a large pot or dutch oven over medium heat. Add butter, onions, thyme, soy, and salt to the onions. Cook for another 15-20 minutes or until caramel and brown. Add in beef stock and bay leaf, and bring to a simmer. Simmer for at least 10 minutes (as you prepare the rest of the ingredients), though you can slow cook for several hours if you have it.
  • Set broiler on high. Arrange 4 soup bowls (oven safe would be wise) on a baking sheet. Transfer the soup to the bowls, covering with the bread and the cheese evenly. Broil for 3-4 minutes or until the cheese is beautiful. Serve as soon as you won’t burn your mouth.


Serving: 4People | Calories: 281kcal

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