Croutons are crunchy cubes of toasted bread that add crunch and extra flavour to soups. To make your own, cut day-old, slightly stale bread into small cubes. Toss with olive oil and seasonings of your choice - eg paprika, mixed herbs, garlic powder - and bake in a single layer at 180 degrees Celsius until golden brown. This will take between 15-20 minutes, and I recommend turning them over halfway through the cooking time.