Preheat the oven to 175°C (350°F).
Grease and lightly flour a Bundt cake pan.
Cream butter and sugar until light and fluffy.
Add eggs one at a time, then mix in vanilla extract.
Combine flour, cocoa powder, and baking powder separately.
Gradually add the dry ingredients and milk to the batter, mixing until smooth.
Pour into the Bundt pan and bake for 40–50 minutes.
Cool completely before removing from the pan and serving.