In a large bowl, whisk flour, both cocoa powders, both sugars, baking soda, baking powder and salt together until thoroughly combined. In a separate bowl, whisk together eggs, buttermilk, vanilla and oil. Make a well in the center of the dry ingredients and pour the wet ingredients into it. Stir until almost combined, then add hot coffee. Keep stirring until everything is just combined. Reserve 2 tbs of chocolate chips to sprinkle on top and gently fold in the rest. You don't want to over-mix or you will have tough muffins.