Let's take a look at Cuisine Adventure French onion soup, one of the best frozen French onion soups at Costco. We'll see how to prepare it in the oven, microwave, and air fryer. To the best of my ability, I have tried to cover all the aspects of this product.

Cuisine Adventures French Onion Soup From Costco
Costco french onion soup has all the same ingredients as the traditional french onion soup, which has onion, Swiss cheese, toast, garlic, and some spices. The soup is precooked before freezing to preserve the flavor. In almost any precooked food company, freezing fast is used to keep food fresh for a longer period of time without losing its flavor.
A French cuisine adventure french onion soup package comes with 6 servings, every 10 ounces in size. Costco sells it for about $9.49. But Maybe while you reading this post there is some change in the price.
Costco 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 of the Costco French soup according to the Cuisine Adventure 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
It states on the package of Costco french onion soup that you should cook frozen soup in the oven for 40 minutes at 400°F (200°C). This is not even close. In my experience and according to many other reviews, Cooking it in the oven at 400°F will take you between 55 minutes and 60 minutes.
The microwave will take about 5 to 7 minutes to heat the Costco french onion soup completely. In the air fryer, you'll need between 30 and 35 minutes at 400 degrees. However, some air fryers will take less time.
Important: All those cooking times are approximate, you can't find the exact time. In that case, you need to heat the french onion soup until the temperature reaches 170°F to 180°F.
How To Cook Costco French Onion Soup In The Oven
- Preheat your oven to 400°F.
- Remove the plastic wrap from the frozen soup.
- Place 1 french onion soup in an ovenproof bowl, cheese on top.
- Heat for about 50 min to 60 min or until reach 165°F and cheese golden brown.
- 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 French Onion Soup In The Microwave
- Place 1 Frozen french onion soup, cheese on top, in a microwave-safe bowl.
- Heat on HIGH for 3 minutes.
- 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 French Onion Soup In The Air Fryer
- Preheat the air fryer to 400°F.
- Remove the frozen french onion soup from the plastic wrap.
- Place into 300 ml bowl capacity bowl.
- Heat for about 30 min.
- Stir and heat until reach 165°F, for about 15 min more.
- Serve and enjoy.
Note: You can top with cheese if desire.

What To Serve With Costco French Onion Soup
In my opinion, there isn't a soup that doesn't pair well with a simple salad. So, serve this Costco french onion soup with a simple healthy salad such as cucumber salad, corn salad, or even potato salad.
With snacks such as mozzarella sticks, chicken wings, pizza bites, mac and cheese bits, etc., Cotco French onion soup works really well.
Below are some ideas to pair with Costco's onion soup:
- Tyson popcorn chicken air fryer
- Mozzarella Sticks
- Alexia Onion Rings Air Fryer
- Butternut Squash Salad
Costco French Onion Soup Nutrition Facts
Serving size: 1 soup (285g)
- Calories 200
- Total Fat 10g
- Saturated Fat 5g
- Trans Fat 0g
- Cholesterol 25mg
- Sodium 740mg
- Total Carbohydrate 18g
- Dietary Fiber 2g
- Total Sugars 5g
- Includes 1g Added Sugars
- Protein 12g

Frequently Asked Questions
You can find Cuisine Adventures French Onion Soup in Costco, Walmart, or almost any supermarket or grocery in The USA and Canada. For More Details, You check Where To Buy from the official Cuisine adventure Website.
Giant Tiger, Walmart, and Instacart. Cuisine adventures french onion soup can be purchased online from these websites and delivered to your door.

Costco French Onion Soup Instruction
Description
Costco french onion soup has all the same ingredients as the traditional french onion soup, which has onion, Swiss cheese, toast, garlic, and some spices. The soup is precooked before freezing to preserve the flavor.
Ingredients
Instructions
- Preheat your oven to 400°F.
- Remove the plastic wrap from the frozen soup.
- Place 1 french onion soup in an ovenproof bowl, cheese on top.
- Heat for about 50 min to 60 min or until reach 165°F and cheese golden brown.
- Serve and enjoy.
- top with Swiss cheese and heat until melted before serving.
Serving Size 1 soup (285g)
Servings 1
- Amount Per Serving
- Calories 200
- % Daily Value *
- Total Fat 10g16%
- Saturated Fat 5g25%
- Cholesterol 25mg9%
- Sodium 740mg31%
- Total Carbohydrate 18g6%
- Dietary Fiber 2g8%
- Sugars 5g
- Protein 12g24%
* Percent Daily Values are based on a 2,000 calorie diet. Your daily value may be higher or lower depending on your calorie needs.
Hamdi Saidani
Well, 1650°F is a little bit warmer :). i just updated and sorry for typo. Thanks for your comment.
Allyssa Caelwaerts
I thought it was a little bland. Added thyme, garlic pepper a dash of cayenne and salt.