In the bowl of an electric mixer, add butter. Beat butter on medium speed with the whisk attachment for about 1 minute, until butter is smooth.
Add 1 cup of powdered sugar, and beat until combined. Repeat with 1 more cup.
Add bakery emulsion and heavy whipping cream and beat until combined.
Add the remaining powdered sugar, one cup at a time, beating until combined after each addition.
Beat for about one additional minute, until frosting is thickened, smooth, and fluffy.
The frosting should be smooth and fluffy, but stiff enough to hold its shape. If it's too stiff, add more whipping cream, half a tablespoon at a time, until you achieve the desired texture (2-3 tablespoons total).