1Preheat your oven to 175°C (350°F). Grease and flour a 20cm (8-inch) round cake pan.
In a large bowl, sift together the all-purpose flour, granulated sugar, unsweetened cocoa powder, baking powder, baking soda, and salt.
In another bowl, whisk together the eggs, whole milk, vegetable oil, and vanilla extract until well combined.
Add the wet ingredients to the dry ingredients and mix until just combined.
Gradually pour in the hot water, mixing gently until the batter is smooth. The batter will be thin; this is normal.
Pour the batter into the prepared cake pan.
Bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean.
Remove the cake from the oven and let it cool in the pan for 10 minutes, then transfer to a wire rack to cool completely before serving or frosting.