Simply Chocolate Frosting

This chocolate frosting goes on thick and satiny; use a wide, flat spreader to create the fat billows.   The ingredients are all basic from the SimplyCooking® pantry.  

simply chocolate frosting

113 grams (1 stick) butter

57 grams (2 oz. or 1/3 cup) chocolate chips

30 grams (about 1/3 cup) cacao powder

2 tsp vanilla extract

150 grams (scant 2 cups) powdered sugar

8 oz.  sour cream

Melt the butter and chocolate chips in a saucepan over low heat, stirring constantly until smooth. Transfer to a large bowl.  Whisk in cacao powder and vanilla.  Whisk in half the powdered sugar and half of the sour cream then the remaining powdered sugar and remaining sour cream.