Preheat oven to 350°F (180°C). Prepare a 9-inch (20 cm) cake pan.
In a saucepan over low heat, melt the granulated sugar until it becomes a golden-brown caramel. Pour the caramel into the bottom of the cake pan and spread evenly.
In a bowl, whisk together the eggs, then whisk in the milk, heavy cream, flour, vanilla extract, and grated orange zest.
Pour the mixture into the caramel-lined pan and place it in a deep baking dish.
Pour hot water into the baking dish to create a water bath, ensuring the water reaches halfway up the sides of the cake pan. Bake for 45-50 minutes, or until the center is just set.
Remove from the oven and let cool to room temperature. Then, invert onto a serving plate, allowing the caramel to become the topping.
Chill the cake in the refrigerator for at least 2 hours. Before serving, dust with powdered sugar.
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