You will need:
1 1/2 cups whipping cream
1/4 cup light corn syrup
2 cups semisweet chocolate pieces
1 tsp vanilla
Stir in the chocolate chips and vanilla until completely melted.
This is what it will look like. Let it get completely cool. I put it in the fridge to speed things up, but sitting on the counter it takes about 1 1/2 hours.
And so this is what happened: everyone arrived for potluck but they came to our house instead of the church sanctuary because it is all set up for VBS and we didn't want to ruin any of the New York City decorations. Then I had to quickly beat the frosting with a mixer, which becomes much lighter and fluffier - almost the consistency of whipped cream - then spread it on the cake really fast because I had ten extra people in my house and a whiny toddler hugging my knees and I forgot all about picture taking. Then we ate 3/4 of the cake and I didn't get any pictures because it was that good and we were busy talking about the minor prophets. But anyway, your supposed to beat it, and then spread it, and it will cool in awesome, fluffy-looking peaks all over the cake! You can see the fluffy peaks here.
So enjoy! Maybe you can make a cake tomorrow to celebrate my birthday in case you needed an excuse ;-)