Dark Chocolate Frosting
1 cube butter
1 box powdered sugar
1 teaspoon vanilla
3 ounces of melted unsweetened chocolate
whipping cream
Too wet? Add more powdered sugar. Too dry? Add more cream.
-Marion Hutchins
Recent improved method:
1 and a half cubes butter
1 box powdered sugar
1 c unsweetened cocoa powder
1 tsp vanilla
¼ c milk
¼ c room temperature coffee
Cream butter and cocoa until smooth. Add sugar and milk to cocoa mixture by adding 1 cup of sugar followed by about a tablespoon of milk/coffee. After each addition has been combined, turn mixer onto a high speed for about a minute. Same with vanilla. Repeat until all sugar and milk/coffee have been added.
If frosting appears too dry, add more milk, a tablespoon at a time until it reaches the right consistency. If it appears too wet and does not hold its form, add more confectioner’s sugar, a tablespoon at a time until it reaches the right consistency.
from: https://addapinch.com/perfect-chocolate-buttercream-frosting-recipe/