Pre heat oven to 325 degrees Fahrenheit.
Combine the hot water to the cocoa powder and stir until dissolved.
Mix all the wet ingredients; the milk, vegetable oil, eggs and vanilla extract. Set aside.
Combine the dry ingredients; all-purpose flour, baking powder, baking soda and sugar in a stand mixer. Add half of the milk mixture and mix for about 3-4 minutes until fluffy.
Add the rest of the milk mixture to the cocoa mixture and stir. When fully combined, add it to the batter and mix just until incorporated.
Bake for 20-30 minutes.