Preheat oven to 350°F (175°C). Grease and line two round baking pans.

In a mixing bowl, whisk together flour, cocoa powder, sugar, baking powder, and salt.

In another bowl, combine eggs, buttermilk, vegetable oil, and vanilla; mix until smooth.

Pour wet ingredients into dry ingredients and stir until just combined.

Divide the batter between the prepared pans and bake for 30-35 minutes. Check doneness with a toothpick.

Cool in pans for ten minutes before transferring to wire racks. Frost once cooled.