preheat oven to 350* F. Prepare two or three 9 inch cake pans by spraying with non stick spray.
Add flour, sugar, cocoa, baking powder, baking soda and salt to the bowl of a stand mixer.
Use paddle attachment to combine well.
In the same bowl, add milk, oil, eggs and vanilla to the dry mixture and mix on medium speed. Once combined, reduce speed and slowly add boiling coffee to the bowl and continue mixing. *Note, the cake batter will be very thin at this point after adding the coffee - don't worry, it's supposed to be!
Evenly distribute the batter into 2 or 3 cake pans and bake for 20 minutes if using three cake pans and 30 minutes if using two.
Cakes are done when a toothpick comes out clean from the center of the cake.
Allow the cake to cool for 7-10 minutes and then remove from cake pans. Allow cakes to fully cool before frosting with your favorite frosting recipe.