Preheat your oven to 350°F (175°C) and grease and flour a 9x13 inch baking pan or two 8-inch round pans.

In a large mixing bowl, whisk together the flour, sugar, baking powder, and salt until no large clumps remain.

Create a well in the center of the dry mixture and add the eggs, milk, vegetable oil, and vanilla extract. Whisk or use an electric mixer on medium speed for about two minutes until smooth.

Slowly pour in the boiling water while whisking gently until combined. The batter will be thin.

Pour the batter into the prepared pan and bake for 30 to 35 minutes for a 9x13 pan or 25 to 30 minutes for round pans, until a toothpick comes out clean.

Let the cake cool in the pan for at least 15 minutes before inverting onto a wire rack to cool completely.