With the rack in the middle position, preheat the oven to 180 °C (350 °F). Butter a 23 x 13-cm (9 x 5-inch) baking dish.
In a bowl, combine milk, cream, eggs, sugar and vanilla. Set aside.
Place chocolate croissant slices at the bottom of the baking dish, placing an apple slice between each. Drizzle with a little egg mixture. Continue layering with remaining ingredients. Let soak for about 10 minutes.
Sprinkle with brown sugar and bake for about 40 minutes. Let cool. Serve warm or cold.
Recipes with the "Healthy Pick" stamp have been evaluated by a registered dietitian member of the Ordre professionnel des diététistes du Québec.