1/2 cup (1 stick) butter
2 cups sifted powdered sugar
1 large egg
Half of a 6-ounce package semi-sweet chocolate chips (chocolate candy bar such
as Dove or other nice chocolate will also work)
butter and sugar together, beat egg and mix in thoroughly.
Spread on cool cake.
Melt chocolate in the microwave, 30 seconds at a
time (about 1.5 minute total depending on chocolate). Cool
slightly (about ten minutes) so you don't melt the white frosting, then spread
melted chocolate over white layer. Chocolate layer should not to too thick,
it's fine to see the white layer as shown in the picture at top.
I usually refrigerate the cake
for a while after frosting to harden up the chocolate, everyone seems to prefer
it that way.