Pre heat oven to 325 degrees Fahrenheit.
Grease three 5 inches round pan lined with parchment paper at the bottom.
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, salt and sugar in a bowl. 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.
Separate in to three equal parts then bake for 30 to 40 minutes.
When fully baked, immediately release from pan and cool in a cooling rack.
Trim, frost and design your cakes to your preference.