In a stand mixer fitted with the paddle attachment, or in a large bowl with a hand mixer, beat the butter and confectioners' sugar together on low speed until well combined.
Turn the mixer to your lowest speed and pour in the heavy cream. Beat until it becomes very creamy and spreadable. Frost your cooled cupcakes!
¼ cup heavy cream
Notes
I make sure that all of my ingredients are at room temperature before I start the recipe, so pull out all of the ingredients before you start baking.Amount of Frosting: this recipe makes enough to generously frost 12 cupcakes or a two layer 8-inch cake. You can double the ingredients to make frosting for 24 cupcakes or a three layer cake. Salt: If you don’t have kosher salt, halve the amount of salt called for in the recipe. 1 teaspoon kosher salt = ½ teaspoon fine salt. Please note I am using Diamond Crystal Kosher Salt, not Morton Salt. Morton salt is too salty for this!Espresso Powder: make sure you are using instant espresso powder and not granules!Storage: Store the cupcakes in the fridge for up to 5 days. Let them sit at room temperature for 30 minutes before eating.