Step by step

Bake on a baking tray on some baking parchment for ten minutes at 170 °C

Tips
Two tips: you can omit the butter and the ‘beans’ will be more crisp. And, secondly, you can also use icing sugar instead of caster sugar.
Trivia
Pellegrino Artusi also discusses different versions of the ‘Beans of the Dead’ in his kitchen writings.