In a large mixing bowl, using an electric mixer, beat together softened unsalted butter and cream cheese on medium speed for 3-4 minutes until well-combined and creamy.
2
Scrape down the sides of the bowl with a spatula.
3
Add powdered sugar, unsweetened cocoa powder, and pure vanilla extract to the bowl.
4
Mix on low speed until powdered sugar and cocoa powder are fully incorporated.
5
Taste the frosting, and if it is too thin or not sweet enough, add more powdered sugar, 1 tablespoon at a time, mixing well after each addition until it reaches your desired consistency and sweetness.