1. Prepare the Crust:

1. Preheat oven to 350°F (175°C). Line baking sheets with parchment paper.
2. In a large bowl, cream together the softened butter and sugar until light and fluffy. Beat in the egg yolk and vanilla extract. Gradually mix in the flour and salt until a soft dough forms.
3. Take a tablespoon of dough and roll it into a 6-inch rope. Shape the rope into a circle, pinching the ends together to form a wreath. Place on the prepared baking sheet. Repeat with remaining dough.
4. Bake for 10-12 minutes, or until the edges are just starting to turn golden. Let cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.
5. Once completely cool, decorate with green icing to look like holly leaves and place three red candies or a cluster of red sprinkles to resemble berries.