Preheat oven to 350
Grease two 8 inch round baking pans
Sift cocoa into bowl to remove clumps. Add the dry ingredients: flour baking soda, salt and sugar until combined
3/4 cup cocoa powder, 1 1/2 cups sugar, 1 1/2 cups cake flour, 1 teaspoon baking soda, 1/4 teaspoon salt
Add eggs and sour cream, and vanilla and mix
2 eggs, 1 cup sour cream, 2 teaspoons vanilla extract
Add hot coffee and chocolate pieces. Mix. If using mixer, it's best to stir this last part by hand.
1/2 cup hot, 1 cup dark chocolate
Pour batter evenly into the 2 pans and bake for 25-32 minutes or until toothpick inserted in center comes out dry
Let cool and remove from pans
Once cool, slice each cake in two so you have four layers
Ice with Mocha frosting