Crush the cookie and knead it with butter. Toast it in the oven and set aside.
Heat the oven to 180º and roast half a pumpkin.
Once roasted and cooled, scrape the pulp and grind it with a blender.
Add the milk, eggs and sugar. Beat more.
Stir in the caramel and fill the custard cups without going all the way to the top.
Place the jars in a pan with water in a bain-marie. Bake in the oven for 25 minutes at 180º.
Allow to cool and serve with the toasted cookie crumbs.