Preheat your oven to 350°F (175°C). Grease and flour two 9-inch round cake pans.
In a large bowl, whisk together the flour, sugar, cocoa powder, baking powder, baking soda, and salt.
Add the eggs, milk, oil, and vanilla extract. Beat on medium speed for 2 minutes.
Stir in the boiling water (batter will be thin). Pour batter into prepared pans.
Bake for 30-35 minutes or until a toothpick inserted into the center comes out clean. Cool in pans for 10 minutes, then remove to wire racks to cool completely.