Preheat your oven to 350 degrees. Spray a 9X13 baking dish with non-stick cooking spray. You could also line the baking dish with parchment paper for extra insurance.
In a large bowl combine the flour, granulated sugar, kosher salt, baking soda, baking powder and cocoa powder.
In another large mixing, whisk together sour cream, buttermilk, eggs, vanilla extract, and vegetable oil. Once the ingredients are combined pour in the hot coffee and continue to mix.
Next, take the wet ingredients and them to the dry ingredients. Whisk the ingredients using a hand mixture for about a minute.
Pour the cake batter into the prepared baking dish. Bake the cake for about 40 to 50 minutes or until a toothpick inserted comes out clean. Remove the cake from the oven and cool completely before frosting and topping with sprinkles.