Cream Cheese Frosting for your birthday cake recipe
8 ounces cream cheese , softened
5 tablespoons unsalted butter softened
1 tablespoon sour cream
1/2 teaspoon vanilla extract
1 1/4 cups powdered sugar
When the birthday cake is cool (remember the 2 hours of cooling you need), process cream cheese, butter, sour cream, and vanilla in clean food processor work bowl until combined, about 5 seconds, scraping down bowl with rubber spatula as needed. Add powdered sugar and process until smooth, about 10 seconds.
If you don't have a food processor you can alternatively use a mixer but you will need to do the following:
Mix cream cheese, butter, sour cream, and vanilla at medium high speed in clean bowl of standing mixer fitted with whisk attachment until well combined, about 30 seconds, scraping down bowl with rubber spatula as needed. Add powdered sugar and mix until very fluffy, about 1 minute.