Preheat oven to 400°F/200°C degrees. Grease 2 9-inch cake round, dust with flour and then line the bottoms with parchment paper.
In a large bowl combine flour, both of the sugars, cocoa, baking soda, baking powder, and salt. Stir with a fork and set aside.
n a mixing bowl blend the milk, oil, eggs, and vanilla until combined. Add the dry ingredients in two batches, with the mixer on low. After the dry ingredients have been incorporated add the hot cup of black coffee. Remember that this batter is thin.
Divide the batter between the cake pans and bake in the 400°F/200°C oven for 5 minutes. This will give you maximum rise.
Then reduce the heat to 350°F/175°C and bake for an additional 20 minutes. Check for doneness with a toothpick, or skewer if it comes out clean they're baked. If a little batter remains, allow them to cook for an additional 3-5 minutes.
Remove from the oven and allow cakes to cool on a rack for 10 minutes then remove from the pans to cool completely. (leave parchment on at this point)