Boil the water in a sauce pan. Move from heat, add in cocoa powder whisking with a hand whisk constantly until the cocoa is melted.
Add the dry ingredients (flour, salt, baking soda, sugar) in a mixing bowl together.
Add liquid ingredients (eggs, oil, buttermilk) into a separate bowl. I add them in a liquid measuring cup.
Add the wet ingredients to the dry while mixer is on medium. Mix until combined.
Scrape in the melted chocolate and mix until combined.
Scoop the batter into a lined cupcake tin. Full them 3/4 of the way full.
Bake in a 325 degree oven for 20-25 minutes until the cake is not jiggly in the center.
Let the cupcakes cool while you make the chocolate frosting.