01 -
Heat oven to 350°F. Line 8-inch cake pan.
02 -
Combine flour, baking powder, sugar and salt.
03 -
Blend oil, vanilla, egg and sour cream.
04 -
Mix wet into dry ingredients until just combined.
05 -
Pour into pan, bake 35-40 minutes.
06 -
Beat butter, add sugar and sour cream until smooth.