make the french toast
Preheat the oven to 225°. In a large baking dish, whisk the eggs with the heavy cream, light brown sugar, vanilla extract and salt. Heat a large cast-iron griddle and lightly butter it. Working in batches, dip half of the brioche slices in the egg mixture, turning them, until they are well-moistened. Transfer the soaked brioche to the griddle and cook over moderate heat, turning once, until the French toast is golden and cooked through, about 4 minutes. Transfer the French toast to a baking sheet, cover loosely with aluminum foil and keep warm in the oven. Repeat with the remaining brioche slices. Serve the French toast with the cranberry sauce and whipped cream.