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Preheat oven to 350 degree F.
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Chop nuts and add to a shallow bowl.
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Separate eggs and put the whites in a shallow bowl and the yolks in with the butter.
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In a mixing bowl, cream the butter, Swerve, vanilla, salt and egg yolks.
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Add in the flour and mix until a dough forms.
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Roll the dough into balls and then dip in the egg whites and then roll in the walnuts.
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Place on a cookie sheet and bake for 5 minutes.
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Pull out of the oven and gently push your thumb into the cookies to make a print.
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Place back into the oven for 7-10 minutes until lightly browned.
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Let cool completely before icing.
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To make the icing, cream the butter, sugar and vanilla using a standing mixer.
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Slowly add the cream and then mix on high for 5-10 minutes until nice and creamy.
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When cookies are cooled, pipe the icing onto the cookies.