Chocolate Sour Cream Frosting is a glossy chocolate frosting with only three ingredients! This easy frosting is slightly tangy, with a deep, pure chocolate flavor. You'll love it on cakes and cupcakes!
Place the chopped chocolate in a large microwave-safe bowl. Microwave in 30-second increments, stirring after every 30 seconds to prevent scorching. Stir until the chocolate is completely melted and smooth.
Add the sour cream and vanilla extract to the chocolate, and whisk well. The frosting will be on the thinner side at first, but as it cools, it will thicken nicely.
Whisk occasionally as it cools to room temperature. Once it has thickened to the texture of buttercream, pipe it on cupcakes or frost your cake. If it becomes too thick to easily spread, reheat it in short bursts in the microwave until you have a workable consistency.
If you want to make the frosting in advance, press a layer of cling wrap on top, and store it at room temperature for several hours, or in the refrigerator for up to a week. It is very hard when cold, so you'll need to gently reheat it in the microwave, whisking well, and then stir as it comes back to frosting consistency.
Because different chocolate and sour creams have different fat percentages, you might find that this frosting needs a little tweaking to get the perfect consistency for you! If it seems too thick as it cools, you can reheat it briefly and stir in more sour cream--try 1/4 cup at a time, tasting and stirring as you go. It's pretty flexible, so don't be afraid to experiment.