How do I know if a frosting will need refrigeration. I usually make my BC with milk and butter and it's fine left out, but I came across this recipe and wasn't sure.
- 12 ounces semisweet chocolate, chopped
- 1 1/2 cups (3 sticks) unsalted butter, at room temperature
- 3 cups confectioners’ sugar
- 3/4 cup sour cream
- pinch kosher salt