How to Cook Costco's French Onion Soup
WEBMar 6, 2022 · Preheat the air fryer to 400 F. Remove the frozen French onion soup from the package. Place the soup into a 300 ml capacity bowl. Heat for about 30 minutes. Stir and heat until the soup reaches 165 F, about 15 minutes more. Serve and enjoy. Note: You can top the soup with cheese if desired.