Are you craving the rich flavors of a classic French Onion Soup but don’t have the time or energy to make it from scratch? Learn how to cook Costco French onion soup. This seasonal favorite is affordable, convenient, and packed with all the traditional ingredients: broth, slow-cooked onions, caramelized onions, croutons, and Swiss cheese.
The soup is precooked before freezing to preserve its flavor, making it easy to prepare in the oven, microwave, air fryer or pot. With no artificial flavors or colors, it’s like having a little French bistro in your freezer. While a homemade traditional French onion soup recipe may be richer in flavors, Costco’s version is a delicious and time-saving alternative.
What ingredients do you need?
You will need the soup itself. A Cuisine Adventure French onion soup package comes with 6 servings, each being about 10 ounces in size. Use as many individual portions of the soup as your heart desires.
If you want to enhance the soup with typical French Onion Soup add-ins, you could consider adding croutons or bread. This will add some extra texture and flavor to the soup. You can also add some extra Swiss or other firm cheese.
What equipment do you need?
You will need basic kitchen equipment depending on what way you decide to cook the soup.
For an oven cooking oven, you will need an ovenproof bowl. If you plan to cook the soup in the microwave, you will need a microwave-safe bowl. For the air fryer method you will need an air fryer and a heat resistant bowl. And if you plan to cook the soup on the stove in a pot, you will need a pot.
In addition to these you will also need some basic kitchen utensils such as a spoon for stirring and serving the soup. You can serve it in soup bowls.
How to cook Costco’s French Onion Soup?
You can cook Costco’s French Onion Soup using several methods, including conventional oven, microwave, air fryer and a pot. The oven method produces the best taste as it allows the cheese to melt and become golden brown on top. However, if you’re short on time, using a microwave can be a quicker option. You can also combine the methods to get the best from both worlds.
How do I cook Costco’s French Onion Soup in the conventional oven?
- Preheat the oven to 400°F (200°C).
- Remove the frozen soup from its package.
- Place it in an ovenproof bowl with the cheese on top.
- Put in preheated oven and heat for 50 to 60 minutes. Make sure it reaches at least 165°F (74°C) and the cheese on top turns golden brown. The package instructions may say 40 minutes, but from my experience, that is usually not enough time.
How do I cook Costco’s French Onion Soup in the microwave?
- Take one portion of frozen French onion soup and put it in a bowl that is safe to use in the microwave. Make sure the cheese is on top.
- Microwave on high for 3 minutes.
- Give it a stir and microwave for an additional 2 minutes.
How do I get a good tasting soup from the oven, but in less time? (quicker oven method)
- Preheat your oven to 400°F (200°C).
- Put the soup in a bowl that is safe for both ovens. Cheese on top.
- Microwave on high for 3 minutes (1200 W).
- Take it out. You can add 2 tablespoons (30 ml) of shredded Swiss or other firm cheese.
- Bake for 20 minutes. Make sure it reaches at least 165°F (74°C) and the cheese on top turns golden brown.
How do I cook Costco’s French Onion Soup in the stove pot?
- Remove the frozen soup from its package.
- Put the burner on medium heat. This will start melting the soup. Move it around the pot occasionally.
- When the melted soup starts to boil, decrease the heat to low. Stir more often to prevent sticking.
- Keep heating for another 5-10 minutes until the soup is fully melted
How do I cook Costco’s French Onion Soup in the air fryer?
- Preheat your air fryer to 400°F (200°C).
- Take the frozen French onion soup out of the package and put it into a heat resistant bowl
- Heat it in the air fryer for about 30 minutes.
- Stir and then heat it for about 15 minutes more or until the soup reaches at least 165°F (74°C).
Frequently asked questions
What is the best tasting method for cooking Costco’s French Onion Soup?
The best tasting method for cooking Costco’s French Onion Soup is using an oven. It allows the cheese to melt and become golden brown on top.
What can I add to enhance the flavor of Costco’s French Onion Soup?
You can enhance the flavor of Costco’s French Onion Soup by adding croutons, bread, or extra Swiss cheese. You can also add herbs and spices like thyme, garlic pepper, cayenne, bay leaf and salt if you find the soup too bland.
How can I add more texture to the soup?
Add more texture to the soup by adding croutons on top. Another way is by adding crusty bread on top. This adds a nice crunch to the dish and also helps to soak up some of the soup’s delicious flavors. You can use any type of bread slices you like, but a crusty French baguette or sourdough bread works particularly well. Simply slice the bread and toast it lightly before placing it on top of the soup. You can also try rubbing the bread with a clove of garlic before toasting for extra flavor. Try adding a bit of olive oil on top.
What is the fastest method for cooking Costco’s French Onion Soup?
The fastest method for cooking Costco’s French Onion Soup is using a microwave. It takes about 5 to 7 minutes to heat up.
What are the ingredients in Costco’s French Onion Soup?
Broth (water, fried onions [onion, canola oil], cooked vegetables [carrot, onion, celery], sunflower oil, salt, onion and carrot powder, yeast extract, brown sugar, sugar, canola oil, roasted malted barley, flavor), Onions, Swiss cheese (milk, salt, bacterial culture, microbial enzyme, calcium chloride, cellulose), Croutons (enriched flour (wheat flour, niacin, reduced iron, thiamine mononitrate, riboflavin, folic acid), sugar, sunflower oil, yeast, salt, ascorbic acid, may contain sesame and soy), Contains 1.5% or less: enriched flour (wheat flour, niacin, reduced iron, thiamine mononitrate, riboflavin, folic acid, may contain sesame and soy), yeast extract, garlic, salt, spices, cellulose gum.
Is the Costco french onion soup vegetarian?
Yes, Costco’s French Onion Soup is vegetarian.
Is the Costco french onion soup vegan?
No, Costco’s Cuisine Adventures French Onion Soup is not vegan. It contains cheese, which is a dairy product
How long does it take to cook Costco’s French Onion Soup?
It takes about 50 to 60 minutes to heat the soup in oven. Reheating in the microwave will take about 5 to 7 minutes. In an air fryer, you’ll need between 30 and 35 minutes at 400°F (200°C) to heat it.
What temperature should Costco’s French Onion Soup reach when cooking?
Costco’s French Onion Soup should reach a temperature of at least 165°F (74°C) when cooking.
How many servings are in a package of Costco’s French Onion Soup?
A package of Costco’s French Onion Soup contains 6 servings.
What is the best tasting method for cooking Costco’s French Onion Soup?
The best tasting method for cooking Costco’s French Onion Soup is using an oven. It allows the cheese to melt and become golden brown on top.
Can I freeze the soup after it has been cooked?
Yes! You can freeze semi-cooked or fully cooked French onion soup for up to three months. Make sure to store it in an airtight container to prevent moisture from forming inside the container.
What happens to the cheese when cooking Costco’s French Onion Soup in the microwave?
When heated in the microwave oven on High for 3 minutes then stirred and heated for 2 minutes more as per instructions on the package, the cheese will melt into the soup.
Should I melt the soup before I start cooking it?
No. The soup is frozen when packaged and should be cooked from frozen according to instructions on the package .
Where can I buy Cuisine Adventures French Onion Soup?
Cuisine Adventures French onion soup is available at Costco, Walmart, and many other supermarkets and grocery stores. While it may be a seasonal item, you can usually get it year-round.
How much does a package of Costco’s French Onion Soup cost?
A package of Costco’s French Onion Soup costs about $9.99 at Costco.
Costco French Onion Soup
Equipment
- 1 Oven (one of the options)
- 1 Microwave (one of the options)
- 1 Air fryer (one of the options)
- 1 Stove pot (one of the options)
- 1 Oven- or microwave-safe bowl
Ingredients
- 1 Costco's Cuisine Adventure French onion soup package
- 2 tbsp Swiss Cheese optional
- 2 slices Crusty French baguette optional
Instructions
Oven instructions (recommended)
- Preheat oven to 400 °F
- Place soup in ovenproof bowl with cheese on top.
- Bake for 50-60 minutes until it reaches 165 °F and cheese is golden brown.
Microwave instructions
- Place soup in microwave-safe bowl with cheese on top.
- Microwave on high for 3 minutes.
- Stir and microwave additional 2 minutes.
Quick oven-microwave instructions
- Preheat oven to 400 °F
- Place soup in ovenproof and microwave proof bowl with cheese on top.
- Microwave on high for 3 minutes (1200 W)
- Bake for 20 minutes until it reaches 165 °F and cheese is golden brown.
Stove pot instructions
- Place soup in a pot with cheese on top.
- Cook on medium heat until it starts melting. Stir occasionally.
- When boiling, reduce to low heat and stir frequently. Cook for another 5-10 mins until fully melted and hot.
Air fryer instructions
- Preheat air fryer to 400 °F.
- Place soup in ovenproof bowl with cheese on top.
- Heat for about 30 minutes.
- Stir and heat for another 15 minutes, check regularly.