French Onion Soup Au Gratin

  • Prep 15 mins
  • Total 58 mins
  • Medium
  • Serves 4

A warm treat on a cold day, this French Onion Soup Au Gratin will take you right to Paris with its flavor. Rich onion soup topped with bubbly cheese and crusty cubes of French bread. It’s comfort in a bowl!

TIP: To make this vegetarian, swap the beef stock for vegetable stock.


  • Contains Milk/Dairy
  • Contains Wheat

Tip: Allergy Advice

This dish contains the following allergens: Milk/Dairy, Wheat

Cooking mode

Step-by-step instruction without your screen going to sleep

  • 2 tablespoons butter
  • 2 large white onions, peeled, cut in 1/4-inch slices
  • 1 tablespoon tomato paste
  • 1 tablespoon soy sauce
  • 1 tablespoon Worcestershire sauce
  • 1 box (32 ounces) beef stock
  • 1 teaspoon kosher salt
  • 1 teaspoon ground black pepper
  • 4 cups crusty French bread, cut in 1-inch cubes
  • 2 cups shredded Mozzarella (or Gruyère) cheese


  • Step 1

    Select SEAR/SAUTÉ and set to MD:HI. Allow to preheat for 5 minutes.

  • Step 2

    Add butter and onions to pot and cook, stirring occasionally, for 10 minutes.

  • Step 3

    Add tomato paste, soy sauce, and Worcestershire sauce to pot. Cook for 5 minutes. Add beef stock, salt, and pepper and cook for an additional 5 minutes. Assemble pressure lid, making sure the PRESSURE RELEASE valve is in the SEAL position.

  • Step 4

    Select PRESSURE and set to HIGH. Set time to 15 minutes. Select START/STOP to begin.

  • Step 5

    When pressure cooking is complete, quick release the pressure by moving the PRESSURE RELEASE valve to the VENT position. Carefully remove lid when unit has finished releasing pressure.

  • Step 6

    Arrange the French bread cubes over the surface of the soup, then place the cheese evenly on top of the bread.

  • Step 7

    Close crisping lid. Select BROIL and set time to 8 minutes. Select START/STOP to begin.

  • Step 8

    When cooking is complete, soup is ready to serve.