Preheat your oven to 325°F (163°C).

Grease an oven-safe baking dish with butter or cooking spray.

In a mixing bowl, whisk together the eggs, sugar, vanilla, and salt until well combined.

Gradually stir in the milk until fully incorporated.

If desired, strain the mixture through a fine mesh sieve into another bowl.

Pour the custard mixture into the prepared baking dish.

Place the baking dish in a roasting pan and fill the pan with hot water until it reaches halfway up the sides of the custard dish.

Bake for about 50 minutes, or until the custard is set and a knife inserted in the center comes out clean.

Let the custard cool completely before slicing.