Directions

1. Preheat oven to 325 degrees. Spray a 9-inch round cake pan with cooking spray. Set aside.
   
2. In a large bowl, whisk together flour, salt, baking powder, baking soda, cocoa powder, and sugar.
   
3. Stir in coffee, oil, and buttermilk and mix just until combined. Add egg and 1/2 teaspoon vanilla and mix until combined. Pour batter into prepared baking pan. Bake on the middle rack for 30 minutes, until a toothpick inserted comes out clean.
   
4. Let cake cool in pan until it is cool enough to touch, and then remove cake and allow to cool completely on a wire rack.
   
5. In a bowl of a standing mixer with a paddle attachment add butter and turn on the mixer until butter is creamed. Slowly add powdered sugar until the mixture is thick and combined. Add in heavy whipping cream and 1/2 teaspoon vanilla extract.
   
6. Mix on medium speed, for 2-3 minutes or until frosting is light and fluffy. Frost cooled cake using an offset spatula and serve immediately.