The creamiest and fluffiest chocolate buttercream frosting that's incredibly versatile. This recipe makes enough to fill and frost an 8 or 9-inch layer cake.
Melt the 6 ounces unsweetened (or bittersweet) chocolate in a heat proof bowl set over simmering water, or melt it in the microwave. Let cool to warm room temperature.
In a large bowl, using an electric mixer or stand mixer, cream the 1 cup unsalted butter. Beat in the chocolate until combined. Beat in the 3-4 cups powdered sugar, and 1-2 tablespoons milk . Beat on low speed until combined, about 1 minute. Stop the mixer and scrape down the sides of the bowl. Increase the speed to medium and beat for 2 minutes until frosting is light and fluffy.
If the frosting feels too dry, add more milk, 1 teaspoon at a time, until it is creamy but still holds peaks.
Notes
Use room temperature butter. I like to use very soft butter, and by that I mean butter that can be pressed with a finger with very little give. When the butter is very soft, it will whip easily and create a smooth base for the buttercream.
Whip the butter well. Start with a base of well-beaten, fluffy butter. This means that you should beat it for about 2-3 minutes, until lighter in color and texture.
Sift the sugar. My no. 2 tip is to sift the powdered sugar before you beat it into the frosting. This will also help to make the smoothest, creamiest buttercream.
Beat in sugar slowly. Reduce the mixer speed to low when adding the powdered sugar so that it doesn't create a huge cloud of sugar in your face! I like to add it slowly, too, so that it incorporates well.
Cool the chocolate slightly. Melt the chocolate first, then allow it to cool for a few minutes (while you whip the butter?) so that it doesn't melt the butter when you add it to the bowl.
Add sugar to taste. I like less sugar because there's sugar in the chocolate, and I like a less-sweet frosting. However, you can add more or less as you prefer.
Adjust texture as needed. Honestly, a lot of times when I prepare this recipe, I wing it a bit. As you get more comfortable making buttercream, you will know when you need a little more milk or a little more powdered sugar. If you wish for a thicker frosting, add more sugar. For a very spreadable frosting, add a little more milk.
Dairy-free. It's easy to make this dairy-free! Use dairy-free chocolate, then your favorite non-dairy butter and non-dairy milk.