9. Meanwhile, to prepare the cream cheese frosting, using the paddle attachment cream the butter, lemon zest, vanilla and salt for 2 minutes or until light and fluffy. With mixing speed on low gradually add the powdered sugar and lemon juice, beat until it forms a thick paste. Add the cream cheese and mix on the lowest speed possible for 1½ minutes, then STOP! Place in refrigerator to chill for at least 15 minutes or until cupcakes have completely cooled. Allow to stand at room temperature for 5 minutes before placing in a bag to pipe on cupcakes.
10. Using a large piping tip, pipe the frosting on top of the cooled cupcakes. Top with a slice of lemon and a sprig of mint, if desired.
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