1. 1. Preheat your oven to 325°F (165°C).

2. 2. In a large mixing bowl, whisk together the eggs until lightly beaten.

3. 3. Gradually pour in the milk, whisking constantly to prevent curdling.

4. 4. Add the sugar and vanilla extract, and whisk until the sugar has dissolved and the mixture is well combined.

5. 5. Pour the custard mixture into a 9-inch pie dish or baking pan.

6. 6. Place the dish in a larger baking pan and pour hot water into the larger pan, creating a water bath (bain-marie) that reaches about halfway up the sides of the custard dish.

7. 7. Bake for 40-50 minutes, or until the custard is set but still slightly jiggly in the center.

8. 8. Remove the custard from the oven and the water bath, and allow it to cool completely before serving.