Preheat the Oven: Preheat your oven to 325°F (160°C). Prepare a baking dish for a water bath (bain-marie) by placing a larger dish that can fit your custard cups or dish inside.

Prepare the Custard Mixture: In a medium mixing bowl, whisk together the eggs, sugar, and salt until well combined. Gradually stir in the milk and vanilla extract, whisking gently to avoid creating too many air bubbles.

Assemble the Custard: Pour the custard mixture into small ramekins or a large baking dish, depending on your preference. Sprinkle a light dusting of nutmeg or cinnamon on top if desired.

Create a Water Bath: Set the ramekins or baking dish into a larger pan to create a water bath. Carefully pour hot water into the larger dish, filling it halfway up the sides of the ramekins to create a water bath.

Bake the Custard: Carefully place the dish in the oven and bake for 40–50 minutes, or until the custard is firm around the edges but has a slight wobble in the center.

Cool and Serve: Take the custard out of the water bath and allow it to cool to room temperature. Serve warm or refrigerate for at least 2 hours if you prefer it chilled. Garnish with additional nutmeg or cinnamon before serving.