Before starting, ensure all your ingredients are at room temperature, especially the butter. This facilitates smoother mixing.
In the bowl of an electric mixer fitted with the paddle attachment, combine the unsalted butter and peanut butter. Beat on medium speed until the mixture is smooth and creamy, usually about 2-3 minutes.
With the mixer on low speed, gradually add the powdered sugar to the butter mixture. Ensure you add the sugar slowly to prevent it from clouding up and making a mess. Once all the sugar has been added, increase the mixer speed to medium and continue beating until the frosting is smooth.
Add the salt and vanilla extract to the mixture, and mix briefly to incorporate. Finally, while the mixer is running, add the heavy cream, starting with 2 tablespoons. Continue to mix until the frosting reaches your desired consistency. If the frosting is too thick, you can add more heavy cream, a tablespoon at a time, until the desired consistency is achieved.
Once the frosting is smooth and spreadable, it's ready to be used on cakes, cupcakes, or any other desserts. Use a spatula or piping bag for application.
Notes
Creamy peanut butter is recommended for this recipe as it provides a smoother consistency for the frosting. However, if you prefer a chunky texture, you can use chunky peanut butter.
The amount of heavy cream needed might vary based on the consistency you desire. Start with the minimum amount and add more as needed.
This frosting can be stored in an airtight container in the refrigerator for up to a week. Before using it again, allow it to come to room temperature and give it a good stir to restore its spreadable consistency.
For an extra touch, consider garnishing your frosted dessert with chopped roasted peanuts or chocolate shavings for added flavor and texture.