This is an amazingly smooth and intensely chocolatey fudge frosting. You can use it for anything!
1 stick butter
1 & 1/2 c. sugar
1 c. cocoa
1/2 t. salt
1 & 1/4 c. heavy cream
1/4 c. sour cream
2 t. vanilla
Melt butter in a saucepan. Stir in sugar, cocoa, and salt until thick and grainy.
Combine heavy cream and sour cream. Slowly add cream mixture to the cocoa mixture and stir over medium heat until combined.
Continue to stir over medium heat for about 6 minutes or until sugar dissolves.
Remove from heat and add vanilla. Let cool at room temperature for 3-4 hours.
I like to mix some of this frosting with whipped cream to make a lighter, mousse-like frosting.
This is the frosting I use for Cookie Cake.
I tell you, it's good stuff!