This instant pot french onion soup is assembled and finished in the oven with toasted french bread slices and a generous amount of gruyre cheese. French onion soup is a comforting lunch or dinner soup. It's the perfect soup for a cold, snowy or rainy day, or serve it as a dinner party first course or appetizer. Using the instant pot, the onions are caramelized quickly and require very little hands-on attention. And if you have a food processor with a slicing disc, prep is a breeze. For the toasted bread topping, use either one large or two small slices to cover the entire top of the soup. A french baguette is ideal.