Beat together unsalted butter and creamy peanut butter until creamy and well-blended.
Gradually add powdered sugar and beat well after each addition. Scrape the bowl as needed.
Mix in vanilla extract and salt.
On low speed, add milk, then increase to high speed and beat for 30 seconds.
- Consider adding 1-2 more cups of powdered sugar for stiffer frosting.
- Can be made ahead and stored in the fridge for up to 5 days. Allow to soften at room temperature and stir well before using.
Calories: 380kcal | Carbohydrates: 35g | Protein: 5g | Fat: 25g | Cholesterol: 40mg | Sodium: 200mg | Potassium: 150mg | Sugar: 33g | Calcium: 18mg