Weeknight French Onion Soup in the Instant Pot: Rich & Fast

Instant Pot French Onion Soup is an easy, fast way to enjoy this classic comfort dish. Sweet caramelized onions with a touch of brown sugar simmer in rich beef stock, then the soup is finished with toasted baguette slices and melted cheese for a cozy, satisfying bowl.

This soup works well as a main course or a side. It pairs nicely with roasted chicken, pasta with pesto, or a hearty pot roast. If you enjoy these flavors, try variations like French Onion Chicken or French Onion Pork Chops.

Instant Pot French Onion Soup Ingredients

To make this Instant Pot French onion soup, gather the following ingredients (see the recipe card below for exact amounts):

• Yellow onions
• Unsalted butter
• Brown sugar
• Garlic cloves
• Flour
• Worcestershire sauce
• Salt and pepper
• Beef stock
• White American cheese
• French baguette

Special Kitchen Items Needed

You will need an electric pressure cooker (Instant Pot) for the fastest results. Oven-safe bowls or crocks are helpful for broiling the cheese topping.

How to Make French Onion Soup in an Instant Pot

Preparing French onion soup in a pressure cooker is straightforward and fast. The pressure cooking step only takes about 10 minutes, plus a short release time.

1. Sauté the onions. Add sliced onions and butter to the Instant Pot and select the sauté function. Cook until the butter melts and the onions soften and become translucent.
2. Caramelize with brown sugar. Stir in the brown sugar and continue to sauté for 3–5 minutes until the sugar melts and the onions begin to caramelize. Turn off the sauté setting.
3. Add the remaining ingredients. Stir in garlic, flour, Worcestershire sauce, salt and pepper, then pour the beef stock over the mixture. Close and lock the lid, set the valve to sealing, and pressure cook on high for 10 minutes. Let the pot naturally release for 10 minutes, then carefully release any remaining pressure.
4. Prepare the bread. Toast baguette slices or place them on a baking sheet under the broiler for 3–5 minutes until lightly browned.
5. Finish with cheese. Ladle the hot soup into oven-safe bowls, top each with a slice of toasted bread and a generous amount of cheese. Place the bowls on a baking sheet and broil until the cheese is bubbly and golden, 3–5 minutes.
6. Serve immediately. The soup is best hot, straight from the oven.

Substitutions and Optional Add-Ins

• Use croutons instead of toasted baguette slices if you prefer.
• If you want a thicker soup, mix 1 tablespoon cornstarch with a little cold water and stir it into the hot soup; let it sit 5–10 minutes to thicken.
• Try different cheeses: shredded or sliced American, Cheddar, Swiss, or Gruyère all work well.