How to Cook Costco's French Onion Soup

Cuisine Adventure French onion soup is one of the best frozen French onion soups at Costco. Here is how to prepare Costco's French onion soup in the oven, microwave, and air fryer.

Cuisine Adventures French Onion Soup From Costco

Costco's French onion soup has all the same ingredients as traditional French onion soup, such as onion, Swiss cheese, toast, garlic, and some spices. The soup is precooked before freezing to preserve the flavor. In almost any company that makes pre-cooked food, flash freezing is used to keep food fresh for a longer period of time without losing its flavor.

A Cuisine Adventure French onion soup package comes with 6 servings, with each being about 10 ounces in size. Costco sells it for about $9.49.

Costco's French Onion Soup Ingredients

Onions, broth, Swiss cheese, and croutons are the main ingredients of Costco's French onion soup. The following is a complete list of ingredients in Costco's French onion soup according to the Cuisine Adventures website.

• Broth: Water, cooked vegetables [onion, carrot, celery], sunflower oil, salt, onion and carrot powder, yeast extract, brown sugar, sugar, canola oil, roasted malted barley, and flavor.
• Swiss cheese: Milk, salt, bacterial culture, microbial enzyme, calcium chloride, and cellulose.
• Croutons: Enriched flour (wheat flour, niacin, reduced iron, thiamine mononitrate, riboflavin, folic acid), sugar, sunflower oil, yeast, salt, ascorbic acid).
• Onions
• Garlic
• Salt
• Spices
• More: Yeast extract, cellulose gum, milk, and soy.

How Long Do You Cook French Onion Soup From Costco?

The package instructions for Costco's French onion soup states that you should cook the frozen soup in the oven for 40 minutes at 400 F (200 C). However, in my experience and according to many other reviews, it will take between 55 minutes and 60 minutes to heat the soup in a 400 F oven.

Reheating Costco's French onion soup in the microwave will take about 5 to 7 minutes to heat. Meanwhile, you'll need between 30 and 35 minutes at 400 F to heat it in an air fryer, although reheating will take less time in some air fryers.

Important: You should heat the French onion soup until the temperature reaches 170 F to 180 F.

How to Cook Costco's French Onion Soup in the Oven 

1. Preheat the oven to 400 F.
2. Remove the frozen soup from its package.
3. Place it in an ovenproof bowl with the cheese on top.
4. Heat for about 50 to 60 minutes or until it reaches 165 F and the cheese is golden brown.
5. Serve and enjoy.

Note: Cooking time may vary according to your oven's performance. Start checking the temperature after 45 minutes.

How to Cook Costco's French Onion Soup in the Microwave

1. Place 1 frozen French onion soup portion in a microwave-safe bowl with the cheese on top.
2. Heat on HIGH for 3 minutes.
3. Stir and heat for 2 minutes more.

Note: The cheese will melt into the soup when heated in the microwave. If desired, top with Swiss cheese and heat until melted before serving.

Costco's French Onion Soup in the Air Fryer

1. Preheat the air fryer to 400 F.
2. Remove the frozen French onion soup from the package.
3. Place the soup into a 300 ml capacity bowl.
4. Heat for about 30 minutes.
5. Stir and heat until the soup reaches 165 F, about 15 minutes more.
6. Serve and enjoy.

Note: You can top the soup with cheese if desired.

Frequently Asked Questions

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Costco’s French Onion Soup Instructions

Yield: 2 serving

Prep Time: 2 minutes

Cook Time: 55 minutes

Additional Time: 3 minutes

Total Time: 1 hour

Cuisine Adventure French onion soup is one of the best frozen French onion soups at Costco. Here is how to prepare Costco’s French onion soup in the oven, microwave, and air fryer.

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Ingredients

• 1 package Cuisine Adventure French onion soup
• 2 tablespoon shredded Swiss cheese (optional)

Instructions

1. Preheat the oven to 400 F.
2. Remove the frozen soup from its package.
3. Place it in an ovenproof bowl with the cheese on top.
4. Heat for about 50 to 60 minutes or until it reaches 165 F and the cheese is golden brown.
5. Serve and enjoy.

Nutrition Information:

Yield: 2 Serving Size: 1
Amount Per Serving:Calories: 265Total Fat: 14gSaturated Fat: 6gTrans Fat: 0gUnsaturated Fat: 6gCholesterol: 28mgSodium: 412mgCarbohydrates: 20gFiber: 1gSugar: 3gProtein: 12g