01 - Cream together the softened butter and granulated sugar until light and fluffy. Beat in the egg yolk and vanilla extract until well combined.
02 - Gradually mix in the all-purpose flour and fine salt until a soft dough forms. Cover the dough and chill for at least 20 minutes.
03 - Scoop approximately 1-tablespoon portions of the dough. Roll each portion into a ball, then coat evenly with the finely chopped pistachios. Use your thumb or the back of a spoon to create an indentation in the center of each cookie.
04 - Fill each indentation with cranberry jam or preserves. Bake in a preheated oven at 177°C (350°F) for 12 to 14 minutes, or until the edges are lightly golden.
05 - Allow the cookies to cool on the baking sheet for 5 minutes before carefully transferring them to a wire rack to cool completely.