Preheat oven to 350 degrees F (175 degrees C). Grease and flour three 8-inch round cake pans.

In a large bowl, whisk together the flour, sugar, cocoa powder, baking soda, baking powder, and salt.

In a separate bowl, whisk together the milk, eggs, oil, and vanilla extract.

Add the wet ingredients to the dry ingredients and mix until just combined.

Stir in the hot water until the batter is smooth.

Pour the batter evenly into the prepared cake pans.

Bake for 30-35 minutes, or until a toothpick inserted into the center of the cakes comes out clean.

Allow the cakes to cool completely before frosting.

In a large bowl, cream together the cream cheese and butter until light and fluffy.

Beat in the cocoa powder, cinnamon, confectioners' sugar, vanilla extract, and heavy cream until smooth.

Frost the cooled cakes and garnish with shaved baker's chocolate.