Heat oven to 350F and grease 2 8"inch round pans. Place parchment paper in each pan to make it easier to lift up after.
Sift all purpose flour, sugar, cocoa powder, baking soda and salt in large bowl. Then add in granulated white sugar into the bow and whisk again.
Pour oil, buttermilk, coffee, eggs and vanilla extract into dry ingredients and mix again.
Bake for 50-55 minutes and cool cake before cutting the domed tops off.
Spread buttercream equally between each layer and spread buttercream on top. Then crush chocolate chips and mix in cocoa powder and sprinkle on top and edges.