Preheat the oven to 360°F.
Butter 12 muffin molds and put one piece of dough in each one of them. Bake for 15 minutes.
Fry the onion for 5 minutes and add sugar and blueberries. Simmer for 15 minutes, stirring every now and then.
Take the dough pieces out of the oven and fill with a spoonful of cream cheese, two small pieces of Camembert cheese, and two spoonfuls of onion with blueberries.
Put in the oven for 10 minutes and serve.
