Prepare Butter: Start by placing 1 cup of softened unsalted butter in a large mixing bowl. Use an electric mixer to beat it until creamy.
Add Sugar: Gradually add in the 4 cups of powdered sugar, mixing well on low speed to avoid a sugar cloud.
Incorporate Cream: Next, pour in the 1/4 cup of heavy cream and 1 teaspoon of vanilla extract.
Mix It Up: Add a pinch of salt and beat the mixture on medium speed until it becomes light and fluffy. This takes about 3-4 minutes.
Frost Away: Use the frosting immediately to decorate your cakes or store it in an airtight container if you’re not using it right away!