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Preheat the oven to 350F and line a 9x13" pan with parchment paper.
Combine the sugar, flour, cocoa powder, salt, baking powder and baking soda in a large mixing bowl.
Add in the eggs, buttermilk, sour cream, oil and vanilla extract and give it a light whisk.
In a small bowl, combine instant coffee powder, chopped chocolate and boiling water. Whisk until smooth and the chocolate is melted.
Add the mixture to the rest of the ingredients and mix until just combined.
Pour into the prepared pan and bake for 30-35 minutes until a toothpick inserted comes out with a few crumbs.
Remove from oven and let it cool completely.
To make the frosting, mix the melted butter, cocoa powder and instant coffee powder in a large bowl.
Mix in the warm milk until smooth. Beat in the powdered sugar slowly until the frosting is smooth.
Spread the frosting evenly on the cake and sprinkle with some flakey salt if desired.
Cut into even pieces and enjoy!