Preheat oven to 350°F (175°C). Grease two round cake pans or line with parchment paper.

In a large bowl, whisk together flour, cocoa powder, baking powder, baking soda, and salt until combined.

In another bowl, beat sugar and eggs until fluffy. Add milk, vegetable oil, and vanilla; mix until smooth.

Gradually incorporate dry ingredients into wet mixture until fully blended; avoid overmixing.

Divide batter between prepared pans and bake for 30-35 minutes or until a toothpick comes out clean.

Cool in pans for 10 minutes before transferring to wire racks. Once cool, frost generously with chocolate frosting.