Beat the softened butter for a minutes with a mixer using the paddle attachment on medium speed.Turn off the mixer and add the 3 cups of sifted powdered sugar and turn your mixer on the lowest speed (so the sugar doesn’t blow everywhere) until the sugar has been incorporated with the butter. The mixture will look clumpy – don’t worry, it’s suppose to!Increase mixer speed to medium and add the vanilla extract, salt, and 2 tablespoons of cream and beat for 2-3 minutes until it is whipped, fluffy, and creamy in appearance.If your frosting needs a more stiff consistency, add remaining sugar. If your frosting needs to be thinned out, add remaining cream 1 tablespoons at a time.