A rich and comforting, French Onion Soup with toasty bread croutons, melted Gruyere and Swiss cheese with sweet caramelized onions cooked in a flavorful broth.
Add onions, ½ tsp salt, ¼ tsp sugar and cook for 20-25 minutes stirring every 5 mins until onions turn golden brown but not burnt. Glass lid can be used during Saute process. After 20 minutes the onions should be golden brown and the bottom of the pot will start to brown.
Open the Instant Pot, remove the bay leaf and discard. Mix all purpose flour in the remaining broth and slowly stir in the soup. Set Instant Pot to Sauté mode and cook for 5 minutes as the soup thickens.
Use a mix of red and yellow onions.
Dry thyme can be substituted for fresh.