Preheat your oven to 375°F (190°C).
If using a puff pastry sheet, cut it into bite-sized pieces and spread them on a baking sheet. Brush with melted butter and bake according to package instructions until golden brown and crisp. Remove from the oven and set aside.
In a saucepan, combine the milk, heavy cream, and sugar. Heat over medium heat until the sugar is dissolved and the mixture is hot but not boiling.
Remove from heat and stir in the vanilla extract, ground cinnamon, and nutmeg (if using).
In a large baking dish or individual oven-safe ramekins, layer the baked puff pastry pieces. Sprinkle with raisins, nuts, shredded coconut (if using), and dried fruits (if using).
Pour the hot custard mixture over the puff pastry and toppings, ensuring that the puff pastry is well soaked.
Drizzle the top with a bit more melted butter.
Bake in the preheated oven for about 20-25 minutes, or until the top is golden brown and the custard is set.
Allow the Om Ali to cool slightly before serving. It can be enjoyed warm or at room temperature.
Enjoy your meal!