butter 2 9 inch cake pans or one 10 inch springform and line with parchment.
combine dry and sift 2 times.
another bol beat butter then add sugar and beat 5 - 6 mins until light and fluffy.
add eggs one at a time.
add sour cream and vanilla and mix well.
slowly beat flour and coffee alternatively into wet.
beat at medium speed for 2 minutes until well blended.
pour into pans and bake 25 to 30 minutes 9 inch or 40 to 50 springform.
allow to cool pans 10 minutes.
for ganache combine chocolate and butter in micorwave 50% power 2 minutes and stir and repeat 30 seconds. sift confectioners sugar into choc and stir a couple of minutes until smooth and ice right away before becomes stiff.